Quiz - biology - Body Fluids and Circulation-A & R questions

Q1. Assertion: Proteins that are produced in response to antibodies are called antigens.
Reason: Antibodies are present on the surface of red blood cells (RBCs). Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q2. Assertion: Heart failure is sometimes referred to as congestive heart failure.
Reason: One of the main symptoms of heart failure is the congestion of the lungs. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q3. Assertion: The sinoatrial node (SAN) is also known as the pacemaker.
Reason: The SAN sets the pace for the electrical activities of the heart. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q4. Assertion: The human heart is myogenic.
Reason: The normal activities of the heart are regulated intrinsically, meaning they are auto-regulated by specialized muscle tissue (nodal tissue). Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q5. Assertion: Leukocytes are also known as white blood cells (WBCs).
Reason: Leukocytes are colorless because they lack hemoglobin. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q6. Assertion: The nodal musculature of the heart is capable of generating action potentials without any external stimuli, making it auto-excitable.
Reason: The number of action potentials that can be generated per minute varies at different parts of the nodal system. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q7. Assertion: Interstitial fluid, or tissue fluid, has a similar mineral distribution to that of plasma.
Reason: The exchange of nutrients and gases between the blood and the cells always takes place through the tissue fluid (lymph). Source: orcusprep.in

NEET Recommended MCQ A & R

medium

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q8. Assertion: Lymph is a colorless fluid containing specialized lymphocytes that are responsible for the body's immune response.
Reason: Lymph is an important carrier for nutrients, hormones, and other substances. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q9. Assertion: A closed circulatory system is considered more advantageous than an open circulatory system.
Reason: In a closed circulatory system, the flow of fluid can be more precisely regulated. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q10. Assertion: Each cardiac cycle includes the systole and diastole of both the atria and ventricles.
Reason: The cardiac output of an ordinary man will be much higher than that of an athlete. Source: orcusprep.in

NEET Recommended MCQ A & R

medium

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q11. Assertion: An ECG is a graphical representation of the electrical activity of the heart during a cardiac cycle.
Reason: Each peak on the ECG is identified with a letter from P to T, representing the electrical activity of the heart. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q12. Assertion: The valves of the heart (semilunar and atrioventricular valves) prevent any backward flow of blood.
Reason: The valves in the heart allow the flow of blood in only one direction, specifically from the atria to the ventricles and from the ventricles to the pulmonary artery or aorta. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q13. Assertion: Neural signals from the sympathetic nerves increase the heart rate, thereby decreasing the cardiac output.
Reason: Adrenaline secretion drastically decreases cardiac output. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q14. Assertion: The human heart is myogenic.
Reason: The human heart is capable of generating a cardiac contraction independent of nervous input. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q15. Assertion: The sympathetic nervous system increases cardiac output.
Reason: It can increase the heart rate and the strength of ventricular contraction. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q16. Assertion: The impulse travels all along the ventricles via the Purkinje fibers.
Reason: Purkinje fibers are spread throughout the ventricle wall. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q17. Assertion: Heart failure is the same as cardiac arrest.
Reason: In heart failure, the heart stops beating. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q18. Assertion: All vertebrates have a hepatic portal system.
Reason: All animals have a hepatic portal system. Source: orcusprep.in

NEET Recommended MCQ A & R

medium

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q19. Assertion: Heparin is an anticoagulant present in our blood that prevents coagulation.
Reason: Calcium ions ($$Ca^{2+}$$) are an essential factor for blood clotting. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q20. Assertion: Mammals have double circulation of blood.
Reason: Mammals have both a pulmonary and a systemic circulation. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q21. Assertion: The cardiac output of an athlete will be much higher than that of an ordinary person during exercise.
Reason: Athletes have an altered stroke volume as well as heart rate, and therefore a higher cardiac output. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q22. Assertion: Calcium ions ($$Ca^{2+}$$) play a very important role in blood clotting.
Reason: Thrombin is an enzyme. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q23. Assertion: Adrenal medullary hormones can also increase cardiac output.
Reason: These hormones increase the heart rate and the strength of ventricular contraction. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q24. Assertion: Upon contraction, the left ventricle generates a high pressure to ensure blood supply to parts of the body far away.
Reason: The wall of the left ventricle is much thinner compared to the wall of the right ventricle. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q25. Assertion: The SA node is called the pacemaker of the heart in human beings.
Reason: The rate of impulse generation is highest in the SA node, and thus it guides the rhythm of the heartbeat. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q26. Assertion: During the joint diastole of the heart, the semilunar valves are open, and the bicuspid and tricuspid valves are closed.
Reason: Maximum blood flow from the ventricle to the atria occurs during joint diastole. Source: orcusprep.in

NEET Recommended MCQ A & R

medium

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q27. Assertion: The lumen of arteries is narrower compared to that of veins.
Reason: The tunica media layer is much thicker in arteries compared to veins. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q28. Assertion: The parasympathetic neural system controls the heart rate and maintains it at 70-75 (72) per minute.
Reason: If all nerve supplies to the SA node are cut, the heart rate will increase. Source: orcusprep.in

NEET Recommended MCQ A & R

medium

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q29. Assertion: The filling of the ventricles occurs during ventricular diastole.
Reason: The pressure in the ventricles decreases compared to the atria during ventricular diastole. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q30. Assertion: In joint diastole, all four chambers of the heart are in a relaxed state.
Reason: The atrioventricular valves are open and the semilunar valves are closed at this stage. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q31. Assertion: A symptom of acute chest pain is called 'Angina pectoris'.
Reason: In this condition, the heart does not pump blood effectively to meet the body's needs. Source: orcusprep.in

NEET Recommended MCQ A & R

hard

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q32. Assertion: After the completion of joint diastole, the SA node generates an impulse which stimulates both atria to undergo simultaneous contraction, known as atrial systole.
Reason: Blood flow to the ventricles increases by 30% during atrial systole. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q33. Assertion: Stroke volume multiplied by heart rate gives the cardiac output.
Reason: The body has the ability to alter the stroke volume and heart rate, thereby changing the cardiac output. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q34. Assertion: The first heart sound is called 'LUB', and the second heart sound is called 'DUB'.
Reason: During each cardiac cycle, two prominent sounds are produced which can be easily heard through a stethoscope. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q35. Assertion: The nodal musculature in the heart has the ability to generate action potentials without any external stimuli.
Reason: The number of action potentials that can be generated per minute in different parts of the nodal musculature is always the same. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q36. Assertion: The blood vessel carrying blood from the right ventricle to the lungs contains deoxygenated blood but is still called a pulmonary artery.
Reason: Any blood vessel carrying blood away from the heart is called an artery. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q37. Assertion: In old age, blood pressure values usually rise.
Reason: The hardening of arteries (arteriosclerosis) occurs in old age, and their elasticity is reduced. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q38. Assertion: Lymph is called the 'middle man' of the body.
Reason: The exchange of nutrients, gases, and other materials between the blood and the cells always occurs through this fluid. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q39. Assertion: We can determine our heart rate by feeling the pulse on the wrist.
Reason: Systole causes the expansion of arteries in the wrist, and diastole causes their relaxation. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q40. Assertion: The human heart is myogenic.
Reason: The entire human heart is made up of cardiac muscles. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q41. Assertion: The 'T-wave' on an ECG represents the return of the ventricles from an excited state to a normal state.
Reason: The end of the 'T-wave' marks the end of systole. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q42. Assertion: Lymph consists of WBCs, plasma proteins, and RBCs.
Reason: Lymph lacks cells. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q43. Assertion: The flow of blood in a closed circulatory system is slower than in an open circulatory system.
Reason: Blood pressure is lower in a closed circulatory system. Source: orcusprep.in

NEET Recommended MCQ A & R

medium

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q44. Assertion: The mixing of oxygenated and deoxygenated blood does not occur in a mammalian heart.
Reason: Within the heart, blood flows in only one direction. Source: orcusprep.in

NEET Recommended MCQ A & R

medium

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q45. Assertion: The enlargement of Q and R waves on an ECG indicates a heart attack.
Reason: Any deviation from a normal ECG indicates some type of abnormality. Source: orcusprep.in

NEET Recommended MCQ A & R

hard

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Q46. Assertion: The SA node is called the pacemaker.
Reason: The SA node generates the least number of action potentials to initiate the rhythmic contraction of the heart. Source: orcusprep.in

NEET Recommended MCQ A & R

easy

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

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Biology - Body Fluids and Circulation-A & R questions

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Biology - Body Fluids and Circulation-A & R questions

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