NEET Biology Multiple Choice Questions – Body Fluids And Circulation

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Body Fluids And Circulation Multiple Choice Question And Answers

Question 1. There is no capillary system in the case of most invertebrates except

  1. Crustaceans
  2. Cephalopods
  3. Insects
  4. Gastropods

Answer: 2. Cephalopods

Question 2. Which of the following cannot be taken as a feature of an open type of circulatory system?

  1. Low-pressure system
  2. Well-regulated blood supply to different organs
  3. Blood returns to the heart slowly
  4. Non-perforation of capillaries

Answer: 2. Well-regulated blood supply to different organs

Question 3. In cockroaches, the dorsal chamber of the hemocoel is called

  1. Pericardial sinus
  2. Perivisceral sinus
  3. Perineural sinus
  4. Peritoneal sinus

Answer: 1. Pericardial sinus

Question 4. A pair of triangular muscles in each segment, present on either side of a cockroach heart, is of

  1. Alary muscles
  2. Tergostemal muscles
  3. Intercostal muscles
  4. Phrenic muscles

Answer: 1. Alary muscles

Question 5. Which is not a function of blood in cockroaches?

  1. Transport of nutrients
  2. Transport of gases
  3. Reservoir of water
  4. Main hydrostatic pressure

Answer: 2. Transport of gases

Question 6. In cockroaches, the anterior end of the heart opens into

  1. Pericardia sinus
  2. Perivisceral sinus
  3. Perineural sinus
  4. Head sinus

Answer: 4. Head sinus

Question 7. A single type of circulation of blood is found in

  1. Fish
  2. Frog
  3. Man
  4. Lizard

Answer: 1. Fish

Question 8. Fishes have venous hearts. The heart receives deoxygenated blood from all over the body except

  1. Fins
  2. Hindlimbs
  3. Gills
  4. Forelimbs

Answer: 3. Gills

Question 9. Find the odd one out.

  1. Prawn and insects
  2. Frog and snails
  3. Snails and mussels
  4. Prawn and mussels

Answer: 2. Frogs and snails

Question 10. Blood is red but no RBCs are found in

  1. Frog
  2. Rabbit
  3. Man
  4. Earthworm

Answer: 4. Earthworm

Question 11. If 1L of blood is drawn out of 5L from the body of a man, how much blood would be left by the next day?

  1. 5L
  2. 4.5L
  3. 4L
  4. 3L

Answer: 1. 5L

Question 12. Ringer solution contains

  1. Iodine and salt
  2. Acetic acid and wax
  3. Sodium and potassium ions
  4. Water and acid fuchsine

Answer: 3. Sodium and potassium ions

Question 13. Which of the following has a neurogenic heart?

  1. Cockroach
  2. Octopus
  3. Frog
  4. Both 1 and 2

Answer: 1. Cockroach

Question 14. Which layer of the heart is responsible for the differential thickness of different chambers?

  1. Epicardium
  2. Myocardium
  3. Endocardium
  4. Pericardium

Answer: 2. Myocardium

Question 15. The two auricles are demarcated externally from the ventricle by an irregular groove called

  1. Inter-auricular septum
  2. Inter-ventricular septum
  3. Coronary sulcus
  4. Inter-ventricular groove

Answer: 3. Coronary sulcus

Question 16. Which of the following pulmonary bypasses are present in the circulatory system before birth?

  1. Foramen ovale
  2. Ductus arteriosus
  3. Conus arteriosus
  4. Both 1 and 2

Answer: 4. Both and

Question 17. The opening of the superior vena cava is guarded by

  1. Semilunar valves
  2. Columnae came
  3. Principal septum
  4. None of these

Answer: 4. None of these

Question 18. The opening of the pulmonary vein is without valves because

  1. It is a very small aperture
  2. It has low blood pressure
  3. Its opening is oblique
  4. None of these

Answer: 3. Its opening is oblique

Question 19. The aperture between the right auricle and the right ventricle is guarded by a one-way valve called

  1. Semilunar valve
  2. Tricuspid valve
  3. Bicuspid valve
  4. Valve of inferior vena cava

Answer: 2. Tricuspid valve

Question 20. Chordae tendinae in the heart are found in

  1. Ventricle
  2. Left auricle
  3. Right auricle
  4. None of these

Answer: 1. Ventricle

Question 21.One of the following lies in the wall of the right auricle

  1. Purkinje fibers
  2. Bundle of His
  3. SA node
  4. Chordae tendinae

Answer: SA node

Question 22. Ventricular systole is stimulated by

  1. SA node
  2. AV valve
  3. AV node
  4. AV aperture

Answer: 3. AV node

Question 23. The Center for Heartbeat Regulation is present in

  1. Pons Varolii
  2. Cerebrum
  3. Cerebellum
  4. Medulla

Answer: 4. Medulla

Question 24. A cardiac cycle involves

  1. Joint diastole-ventricular systole-auricular systole
  2. Auricular systole-ventricular systole-complete cardiac diastole
  3. Auricular systole-joint diastole-ventricular systole
  4. Auricular systole-ventricular diastole-joint diastole

Answer: 2. Auricular systole-ventricular systole-complete cardiac diastole

Question 25. Mammals are said to have a double circulatory system. It means that

  1. There are two types of blood vessels attached to every organ, for example, an artery and a vein.
  2. There are two systems, one from the heart to the lungs and back to the rest of the body via the Heart.
  3. The blood circulates twice in the heart.
  4. Both 2 and 3

Answer: 4. Both 2 and 3

Question 26. The duration of the ventricular diastole in a normal cardiac cycle is

  1. 0.3 s
  2. 0.5 s
  3. 0.4 s
  4. 0.7 s

Answer: 2. 0.5 s

Question 27. The time interval between the closure of the semilunar valve and the closure of the AV valve is

  1. 0.3 s
  2. 0.5 s
  3. 0.1 s
  4. 0.7 s

Answer: 2. 0.5s

Question 28. The walls of arteries and veins differ from each other mainly w.r.t.

  1. Tunica adventitia
  2. Tunica media
  3. Tunica externa
  4. Tunica intima

Answer: 2. Tunica media

Question 29. The course of blood from the heart to the lungs and back to the heart is called

  1. Systemic circulation
  2. Pulmonary circulation
  3. Single circulation
  4. Double circulation

Answer: 2. Pulmonary circulation

Question 30. The superior mesenteric artery supplies blood to

  1. Pancreas and ileum
  2. Hepatic and lien gastric arteries
  3. Both (1) and (2)
  4. The caucus and proximal half of the large intestine

Answer: 1. Pancreas and ileum

Question 31. The blood from the diaphragm is collected by

  1. Phrenic vein
  2. Iliac vein
  3. Hepatic vein
  4. Renal vein

Answer: 1. Phrenic vein

Question 32. The hypogastric artery supplies blood to

  1. Urinary bladder
  2. Pancreas
  3. Abdominal body wall
  4. Both 2 and 3

Answer: 1. Urinary bladder

Question 33. A portal system is one in which

  1. A vein starts from an organ and ends up in the heart
  2. A vein starts from an organ and ends up in another organ
  3. A vein starts from the heart and ends up in the lungs
  4. None of these

Answer: 2. A vein starts from an organ and ends up in another organ

Question 34. The hepatic portal system is present in

  1. Fishes, amphibians, and reptiles
  2. Reptiles and birds
  3. All mammals
  4. All vertebrates

Answer: 4. All vertebrates

Question 35. The middle man of the body is

  1. Blood
  2. Plasma
  3. Lymph
  4. Scrum

Answer: 3. Lymph

Question 36. Lymph differs from blood in possessing

  1. More proteins and fewer waste products
  2. Fewer proteins and more waste products
  3. More proteins and waste products
  4. Fewer proteins and waste products

Answer: 2. Fewer proteins and more waste products

Question 37. Lymphatic vessels from the lower body part form

  1. Right lymphatic duct
  2. Thoracic duct
  3. Carotid duct
  4. Jugular duct

Answer: 2. Thoracic duct

Question 38. The thoracic duct opens into

  1. Right subclavian artery
  2. Left subclavian artery
  3. Right subclavian vein
  4. Left subclavian vein

Answer: 4. Left subclavian vein

Question 39. Which of the following waves of ECG shows ventricular depolarization?

  1. P wave
  2. QRS wave
  3. T wave
  4. U wave

Answer: 2. QRS wave

Question 40. The time taken by the impulse to travel through the atria, AV node, and the rest of the conducting tissue is

  1. PQ interval
  2. PQRS interval
  3. QRS interval
  4. ST segment

Answer: 1. PQ interval

Question 41. PQ interval gets lengthened during

  1. Rheumatic fever
  2. Arteriosclerotic heart (plaque formation)
  3. Arteriosclerotic heart (calcification)
  4. All of these

Answer: 4. All of these

Question 42. William Harvey is known for the discovery of

  1. Blood transfusion
  2. Blood clotting
  3. Blood circulation
  4. Blood purification

Answer: 3. Blood circulation

Question 43. Which one of the following does not have an open circulatory system?

  1. Chelone
  2. Cockroach
  3. Frog’s tadpole
  4. 1 and 2 both

Answer: 4. 1 and 2 both

Question 44. The heart of a crocodile consists of

  1. A single auricle and two ventricles
  2. Two auricles and a single ventricle
  3. Two auricles and two ventricles
  4. A single auricle and a single ventricle

Answer: 3. Two auricles and two ventricles

Question 45. Which of the following has a myogenic heart?

  1. Frog
  2. Humans
  3. Rabbit
  4. All of the above

Answer: 4. All of the above

Question 46. Purkinje fibers are special types of

  1. Muscle fibers located in the heart
  2. Nerve fibers located in the cerebrum
  3. Connective tissue fibers joining one bone to another bone
  4. Sensory fibers extending from the retina into the optic nerve

Answer: 1. Muscle fibers located in the heart

Question 47. The regulation of heartbeat in mammals is due to

  1. The volume of blood in the circulatory system
  2. The presence of excess oxygen in the blood
  3. The presence of thyroxine in blood
  4. The presence of a pacemaker in the heart

Answer: 4. The presence of a pacemaker in the heart

Question 48. The first heart sound is

  1. “LUb” sound at the end of systole
  2. “Dub” sound at the end of systole
  3. “Lub” sound at the beginning of systole
  4. “Dub” sound at the beginning of systole

Answer: 3. “Lub” sound at the beginning of systole

Question 49. Which one is the correct route through which pulse-making impulse travels in the heart?

  1. SA node → Purkinje fibers Bundle of His → AV node → Heart muscles
  2. AV node → SA node → Purkinje fibers Bundle of Mis → Heart muscles
  3. AV node —> Bundle of Mis —> SA node —> Purkinje fibers Heart muscles
  4. SA node → AV node → Bundle of Mis → Purkinje fibers Heart muscles

Answer: 4. SA node → AV node → Bundle of Mis → Purkinje fibers Heart muscles

Question 50. If the vagus branch of the frog is stimulated, the heart will show

  1. Stoppage of heartbeat
  2. Decreased heartbeat
  3. Increased heartbeat
  4. No change

Answer: 2. Decreased heartbeat

Question 51. During diastole

  1. Blood enters lungs
  2. Blood leaves the ventricle
  3. Blood leaves the heart
  4. Blood enters the heart

Answer: 4. Blood enters the heart

Question 52. During the systole of the ventricle

  1. Blood enters the heart
  2. Blood leaves the heart
  3. Blood leaves the ventricle
  4. Blood enters lungs

Answer: 3. Blood leaves the ventricle

Question 53. The apex beat of the heart is synchronous with

  1. First sound
  2. Second sound
  3. Third sound
  4. Fourth sound

Answer: 1. First sound

Question 54. Covering of the heart is called

  1. Pericardium
  2. Peritoneum
  3. Perineurium
  4. Periosteum

Answer: 1. Pericardium

Question 55. Post caval in the right auricle is guarded by

  1. Eustachian valve
  2. Bicuspid valve
  3. Tricuspid valve
  4. Atrioventricular valve

Answer: 1. Eustachian valve

Question 56. Tunica media of an elastic artery is made up of mainly

  1. Smooth muscle fiber
  2. Loose alveolar tissue
  3. Elastic fibers
  4. Collagen fibers

Answer: 1. Smooth muscle fiber

Question 57. How much of the total blood volume is present in the heart

  1. 2.5 %
  2. 17%
  3. 9%
  4. 15%

Answer: 3. 9%

Question 58. Pylangium is part of

  1. Truncus arteriosus
  2. Left atrium
  3. Right atrium
  4. Ventricles

Answer: 1. Truncus arteriosus

Question 59. The coronary sinus in the heart is situated along its

  1. Left margin
  2. Right margin
  3. Diaphragmatic surface
  4. The lower border of the heart

Answer: 2. Right margin

Question 60. In all the leads of ECG, all the following waves except

  1. P
  2. Q
  3. R
  4. T

Answer: 2. Q

Question 61. Cardiac output signifies

  1. The amount of blood entering the heart per unit of time
  2. The amount of blood entering the lung per unit time
  3. The amount of blood leaving the heart per unit of time
  4. The amount of blood leaving the lung per unit time

Answer: 3. The amount of blood leaving the heart per unit of time

Question 62. Heartbeat in vertebrates is

  1. Neurogenic
  2. Myogenic
  3. Both
  4. None

Answer: 2. Myogenic

Question 63. Single heart circuit occurs in

  1. Fishes
  2. Frog
  3. Reptiles
  4. Man

Answer: 1. Fishes

Question 64. Which of these has a closed type of circulatory system?

  1. Cockroach
  2. Fish
  3. Mollusca
  4. Scorpion

Answer: 2. Fish

Question 65. The study of the blood circulation system is called

  1. Angiology
  2. Cardiology
  3. Hematology
  4. Osteology

Answer: 1. Angiology

Question 66. The Father of angiology is

  1. William Harvey
  2. Batson
  3. Marcello Malpighi
  4. Landstar

Answer: 1. William Harvey

Question 67. The color of lymph is

  1. White
  2. Pale yellow
  3. Colorless
  4. Milky

Answer: 3. Colorless

Question 68. Lymph nodes in man are found abundantly in

  1. Fingers
  2. Neck
  3. Arms
  4. Legs

Answer: 2. Neck

Question 69. Coagulation of lymph is

  1. Faster than blood
  2. Not possible
  3. Slower than blood
  4. A passive process

Answer: 3. Slower than blood

Question 70. An artery can be distinguished from a vein in having

  1. Thicker wall
  2. Lesser lumen
  3. No valves
  4. All of the above

Answer: 4. All of the above

Question 71. Glucose is carried from the digestive tract to the liver by

  1. Hepatic artery
  2. Hepatic portal vein
  3. Pulmonary vein
  4. None of the above

Answer: 2. Hepatic portal vein

Question 72. The pulmonary artery differs from the pulmonary vein in having

  1. Thick wall
  2. Thin wall
  3. Valves
  4. Both 2 and 3

Answer: 1. Thick wall

Question 73. Ventricular contraction is in the command of

  1. SA node
  2. Purkinje fibers
  3. AV node
  4. Papillary muscles

Answer: 1. SA node

Question 74. Fully digested food reaches to liver by

  1. Hepatic portal vein.
  2. Hepatic artery
  3. Hepatic vein
  4. All the above

Answer: 1. Hepatic portal vein.

Question 75. The impulse of heartbeat originates from

  1. SA node
  2. AV node
  3. Vagus nerve
  4. Cardiac nerve

Answer: 1. SA node

Question 76. Which of the following statements is true for lymph?

  1. WBC and serum
  2. All components of blood except RBCs, platelets, and some proteins
  3. RBCs, WBCs, and plasma
  4. RBCs, proteins, and platelets

Answer: 2. All components of blood except RBCs, platelets, and some proteins

Question 77. Bundle of His is a network of

  1. Muscle fibers distributed throughout the hem I walls
  2. Muscle fibers found only in the ventricle wall
  3. Nerve fibers distributed in ventricles
  4. Nerve fibers found throughout the heart

Answer: 2. Muscle fibers found only in the ventricle wall

Question 78. Systemic heart refers to

  1. The heart contracts under stimulation from the nervous system
  2. Left auricle and left ventricle in higher vertebrates
  3. Entire heart in lower vertebrates
  4. The two ventricles together in humans

Answer: 2. Left auricle and left ventricle in higher vertebrates

Question 79. The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted into him. It is likely that it will be drafted at the site of

  1. Purkinje system
  2. SA node
  3. AV node
  4. AV bundle

Answer: 2. SA node

Question 80. Which of the following has no muscular wall?

  1. Artery
  2. Vein
  3. Arteriole
  4. Capillary

Answer: 4. Capillary

Question 81. The process of blood clot formation within the circulatory system is 

  1. Thrombosis
  2. Thrombocytes
  3. Thrombin
  4. Thrombocytopenia

Answer: 1. Thrombosis

Question 82. When the right ventricle contracts, the blood goes into

  1. Aorta
  2. Brain
  3. Pulmonary artery
  4. None

Answer: 3. Pulmonary artery

Question 83. The splenic artery arises from

  1. Anterior mesenteric artery
  2. Coeliac artery
  3. Posterior mesenteric artery
  4. Intestinal artery

Answer: 3. Posterior mesenteric artery

Question 84. Which of the following carries glucose from the digestive tract to the liver

  1. Hepatic artery
  2. Hepatic portal vein
  3. Pulmonary vein
  4. None of these

Answer: 2. Hepatic portal vein

Question 85. Systemic heart refers to

  1. The two ventricles together in humans
  2. The heart contracts under stimulation from the nervous system
  3. Left auricle and left ventricle in higher vertebrates
  4. Entire heart in lower vertebrates

Answer: 3. Left auricle and left ventricle in higher vertebrates

Question 86. Carotid artery carries

  1. Impure blood from the brain
  2. Oxygenated blood to the anterior region of the body or to the brain
  3. Impure blood to the kidney
  4. Oxygenated blood to the heart

Answer: 3. Impure blood to the kidney

Question 87. Blood circulation that starts in capillaries and ends in capillaries is called

  1. Mortal circulation
  2. Hepatic emulation
  3. Cardiac circulation
  4. None of these

Answer: 2. Hepatic emulation

Question 88. A portal system is a system in which

  1. A vein starts in front of an organ and ends up in the heart
  2. An artery breaks up in an organ ami visits by the union of its capillaries.
  3. The blood from the gut is brought into the kidney before it is poured into the posterior vena cava.
  4. A vein breaks up in an organ into capillaries and restarts by their union as a new vein in the same organ.

Answer: 1. A vein starts in front of an organ and ends up in the heart

Question 89. Spleen is

  1. Hematopoietic
  2. Lymphoid
  3. Reproductive
  4. Celluloid

Answer: 2. Lymphoid

Question 90. In connection with the circulatory system, valves are present

  1. Not only in heart and blood vessels or vertebrates and invertebrates but in vertebrate lymphatics as well
  2. In vertebrate hearts only
  3. In both vertebrate and invertebrate hearts
  4. In both vertebrate and invertebrate hearts and their blood vessels as well

Answer: 2. In vertebrate hearts only

Question 91. The function of the human spleen is

  1. Control the pulse rate
  2. Secrete hormone
  3. Stimulate heart
  4. Control blood volume

Answer: 4. Control blood volume

Question 92. The “Bundle of His” is a part of which one of the following organs in humans?

  1. Brain
  2. Heart
  3. Kidney
  4. Pancreas

Answer: 2. Heart

Question 93. Arteries are best defined as the vessels which

  1. Supply oxygenated blood to different organs
  2. Break up into capillaries which reunite to form a vein
  3. Break up into capillaries which reunite to form an artery
  4. Carry blood from one visceral organ to another visceral organ

Answer: 1. Supply oxygenated blood to different organs

Question 94. The ECG of a normal human. Which one of its components in humans is correctly interpreted below

NEET Biology Breathing And Exchange Of Gases ECG Of A Normal Human

  1. Complex QRS—One complete Pulse
  2. Peak T—Initiation of total cardiac contraction
  3. Peak P and R together—Systolic and diastolic blood pressures
  4. Peak P—Initiation of left atrial contraction only

Answer: 2. Peak T—Initiation of total cardiac contraction

Question 95.In a standard ECG, which one of the following alphabets is the correct representation of the respective activity of the human heart?

  1. P: depolarization of the atria
  2. R: repolarization of ventricles
  3. S: start of systole
  4. T: end of diastole

Answer: 1. P: depolarization of the atria

Question 96. If due to some injury, the chordae tendinae of the tricuspid valve of the human heart is partially non-functional, what will be the immediate effect?

  1. The pacemaker will stop working.
  2. The blood will tend to flow back into the left atrium.
  3. The flow of blood into the aorta will be slowed down.
  4. The flow of blood into the pulmonary artery will be reduced.

Answer: 4. The flow of blood into the pulmonary artery will be reduced.

Question 97. The fastest distribution of some injectable material/medicine with no risk of any kind can be achieved by injecting it into the

  1. Muscles
  2. Arteries
  3. Veins
  4. Lymph vessels

Answer: 3. Veins

Question 98. Which statement is true about the venous blood vessels of frogs?

  1. Lingual and submandibular unite to form internal jugular.
  2. Musculocutaneous and brachial unite to form the subclavian.
  3. The ventral abdominal vein drains into the posterior vena cava.
  4. The pelvic veins unite from the renal portal vein.

Answer: 3. The ventral abdominal vein drains into the posterior vena cava.

Question 99. Which of the following is not a major organ of the lymphatic system?

  1. Spleen
  2. Kidney
  3. Thymus
  4. Lymph nodes

Answer: 2. Kidney

Question 100. Lymph vessels are united to form

  1. Lymph heart
  2. Cisterna chyli
  3. Thoracic duct
  4. Jugular vein

Answer: 3. Thoracic duct

Question 101. Cardiac output is determined by

  1. Heat rate
  2. Stroke volume
  3. Blood flow
  4. Both 1 and 2

Answer: 4. Both 1 and 2

Question 102. In the frog heart, there are cardiac muscles that consist of fibers called

  1. Myonemes
  2. Telodendria
  3. Purkinje fibers
  4. Columnae came

Answer: 3. Purkinje fibers

Question 103. During high blood pressure, regulation of heartbeat and circulation is controlled by

  1. Vasodilator and vasconstrictor centers
  2. Cardio-stimulatory and vasoconstrictor centers
  3. Cardio-inhibitory and vasoconstrictor centers
  4. Cardio-inhibitory and vasodilator centers

Answer: 4. Cardio-inhibitory and vasodilator centers

Question 104. Blood pressure is measured by

  1. Sphygmomanometer
  2. Phonocardiogram
  3. Electrocardiogram
  4. Stethoscope

Answer: 1. Sphygmomanometer

Question 105. All veins have deoxygenated blood except

  1. Renal vein
  2. Hepatic vein
  3. Hepatic portal vein
  4. Pulmonary veins

Answer: 4. Pulmonary veins

Question 106. Common thrombosis leading to myocardial infarction is of

  1. Right circumflex coronary artery
  2. Left circumflex coronary artery
  3. Left anterior descending artery
  4. Right coronary artery

Answer: 3. Left anterior descending artery

Question 107.Thrombosis in which coronary artery is met most frequently in myocardial infarction?

  1. Right coronary artery
  2. Left anterior descending artery
  3. Left circumflex coronary artery
  4. Right circumflex coronary artery

Answer: 2. Left anterior descending artery

Question 108. Which organ receives only oxygenated blood?

  1. Gill
  2. Spleen
  3. Lung
  4. Liver

Answer: 2. Spleen

Question 109. Which blood vessel brings oxygenated blood to the left auricle?

  1. Pre caval vein
  2. Post caval vein
  3. Pulmonary vein
  4. Pulmonary artery

Answer: 3. Pulmonary vein

Question 110. Oxygenated blood is carried by

  1. Pulmonary vein
  2. Pulmonary artery
  3. Renal vein
  4. Hepatic portal vein

Answer: 1. Pulmonary vein

Question 111. The blood vessel that brings oxygenated blood from the lungs toward the heart of the frog is

  1. Pre cava
  2. Postcaval
  3. Pulmonary vein
  4. Pulmonary artery

Answer: 3. Pulmonary vein

Question 112. All arteries carry oxygenated blood except

  1. Systemic
  2. Hepatic
  3. Pulmonary
  4. Cardiac

Answer: 3. Pulmonary

Question 113. The blood vessel of a frog which opens in its right ventricle bringing oxygenated blood is

  1. Pulmocutaneous artery
  2. Inferior vena cava
  3. Pulmocutaneous vein
  4. Superior vena cava

Answer: 1. Pulmocutaneous artery

Question 114. A yellow substance oozing out from the wound has

  1. Lymph + RBC + WBC
  2. Lymph + RBC + Dead bacteria
  3. Lymph + WBC + Dead bacteria
  4. Lymph + Dead leucocytes

Answer: 3. Lymph + WBC + Dead bacteria

Question 115. Which organ is considered as “graveyard of RBCs,” where most of them are destroyed by macrophages?

  1. Red bone marrow
  2. Spleen
  3. Kidney
  4. Intestine

Answer: 2. Spleen

Question 116. The Iliac artery carries blood to

  1. Hind limb
  2. Forelimb
  3. Lung
  4. Brain

Answer: 1. Hind limb

Question 117. The hypophyseal portal system is found in

  1. Kidney
  2. Liver
  3. Brain
  4. Heart

Answer: 3. Brain

Question 118. The standard ECG of a normal person. The P-wave represents the

NEET Biology Breathing And Exchange Of Gases P Wave Represents

  1. Initiation of the ventricular contraction
  2. Beginning of the system
  3. End of systole
  4. Contraction of both the atria

Answer: 4. Contraction of both the atria

Question 119. The schematic plan of blood circulation in humans with labels A to D. Identify the label and give its functions.

NEET Biology Breathing And Exchange Of Gases Schematic Plan Of Blood Circulation

  1. B—Pulmonary artery—takes blood from heart to lungs, po2 = 90 mm Hg
  2. C—Vena Cava—takes blood from body parts to the right auricle, pco2 = 45 mm Hg
  3. D —Dorsal aorta—takes blood from the heart to body parts, po2 = 95 mm Hg
  4. A—Pulmonary vein—takes impure blood from body parts, po2 = 60 mm Hg

Answer: 2. C—Vena Cava—takes blood from body parts to the right auricle, pco2 = 45 mm Hg

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