NEET UG Body Fluids and Circulation Mock Test – Free Online Test with Score

Q1. Angina pectoris is a symptom characterized by chest pain, which results from:

A Inflammation of the pericardium, leading to fluid accumulation around the heart.
B Malfunction of the heart valves, causing regurgitation.
C A complete blockage of a coronary artery, leading to myocardial infarction.
D Insufficient oxygen supply to the heart muscle, typically due to narrowed coronary arteries.

Q2. If a person's systolic pressure is 140 mmHg and their diastolic pressure is 90 mmHg, what is their pulse pressure and mean arterial pressure (MAP)?

A Pulse Pressure = 50 mmHg, MAP = 115 mmHg
B Pulse Pressure = 50 mmHg, MAP = 106.67 mmHg
C Pulse Pressure = 50 mmHg, MAP = 90 mmHg
D Pulse Pressure = 230 mmHg, MAP = 115 mmHg

Q3. The final step in the blood clotting cascade is the conversion of fibrinogen to fibrin. Which enzyme catalyzes this specific reaction?

A Factor Xa
B Plasmin
C Prothrombinase
D Thrombin

Q4. Warfarin is an anticoagulant medication that interferes with the synthesis of vitamin K-dependent clotting factors. Which specific mechanism does it target?

A Promoting the breakdown of existing clots.
B Preventing platelet aggregation.
C Impairing the liver's ability to produce factors II, VII, IX, and X.
D Directly inhibiting thrombin activity.

Q5. How does lymph primarily differ from blood plasma in composition?

A Lymph contains significantly fewer proteins and no red blood cells.
B Lymph contains a higher concentration of metabolic wastes and nutrients.
C Lymph contains a higher concentration of proteins and blood cells.
D Lymph has a higher concentration of oxygen and a lower concentration of carbon dioxide.

Q6. A person with type A blood is in urgent need of a transfusion. There are two donors available: one with type AB blood and another with type O blood. Considering only the ABO system, which donor's blood could potentially be transfused without immediate severe agglutination reactions?

A Both type AB and type O blood, as long as Rh factor matches.
B Type O blood, as it lacks A and B antigens.
C Neither type AB nor type O blood due to incompatibility.
D Type AB blood, because it contains both A and B antigens.

Q7. Which of the following animals possesses a single circulation system, where blood passes through the heart only once during one complete circuit of the body?

A Lizard.
B Pigeon.
C Frog.
D Fish.

Q8. Which of the following is the correct sequence of events in hemostasis, after injury to a blood vessel?

A Platelet plug formation -> Coagulation -> Vascular spasm.
B Coagulation -> Vascular spasm -> Platelet plug formation.
C Vascular spasm -> Platelet plug formation -> Coagulation.
D Platelet plug formation -> Vascular spasm -> Coagulation.

Q9. During severe hemorrhage, the body attempts to maintain blood pressure. Which of the following compensatory mechanisms would NOT primarily contribute to maintaining mean arterial pressure?

A Vasodilation of systemic arterioles.
B Increased sympathetic nervous system activity.
C Release of antidiuretic hormone (ADH).
D Activation of the renin-angiotensin-aldosterone system.

Q10. Following a severe hemorrhage, the body attempts to compensate by:

A Decreasing heart rate and increasing vasodilation.
B Increasing capillary filtration and decreasing colloid osmotic pressure.
C Increasing heart rate and peripheral vasoconstriction.
D Decreasing erythropoietin release and increasing urine output.

Q11. The release of Atrial Natriuretic Peptide (ANP) from the heart is stimulated by:

A Sympathetic nervous system stimulation.
B Activation of the renin-angiotensin-aldosterone system.
C High blood volume and atrial stretching.
D Low blood volume and pressure.

Q12. Place the following events of the cardiac cycle in the correct chronological order, starting after ventricular filling: 1. Ventricular ejection 2. Isovolumetric ventricular contraction 3. Isovolumetric ventricular relaxation 4. Atrial systole

A 4, 2, 1, 3
B 2, 3, 1, 4
C 1, 2, 3, 4
D 2, 1, 3, 4

Q13. A patient living at high altitude for an extended period would likely exhibit:

A No significant change in red blood cell count due to acclimatization.
B Decreased erythropoietin secretion and lower hematocrit.
C Increased white blood cell count to compensate for lower oxygen.
D Increased erythropoietin secretion and higher hematocrit.

Q14. Which of the following structural adaptations allows capillaries to be the primary site of nutrient and waste exchange?

A Single-cell thick walls and narrow diameter.
B Thick muscular walls to withstand high pressure.
C Large lumen to accommodate high blood flow.
D Presence of valves to prevent backflow.

Q15. The sinoatrial (SA) node is known as the natural pacemaker of the heart primarily because:

A It directly controls the opening and closing of heart valves.
B Its cells have the fastest intrinsic rate of spontaneous depolarization.
C It is innervated by both sympathetic and parasympathetic nerves.
D It is the only part of the conduction system capable of generating action potentials.

Q16. Erythropoietin (EPO), a hormone, plays a critical role in the production of red blood cells. Where is EPO primarily produced in response to hypoxia?

A Spleen
B Bone marrow
C Liver
D Kidneys

Q17. Which of the following statements about erythrocytes (red blood cells) is INCORRECT?

A They are biconcave, anucleated cells in mammals.
B They are produced in the bone marrow.
C They contain hemoglobin for oxygen transport.
D They have a relatively short lifespan of about 10-20 days.

Q18. A patient undergoing treatment for severe anaphylactic shock is given an adrenaline (epinephrine) injection. How does adrenaline help stabilize the patient's circulatory system?

A By directly increasing the oxygen-carrying capacity of blood.
B By decreasing heart rate and promoting vasodilation.
C By increasing heart rate, strengthening cardiac contraction, and causing vasoconstriction.
D By stimulating acetylcholine release, thus lowering blood pressure.

Q19. The "lub-dub" sounds of the heart are associated with which events in the cardiac cycle?

A "Lub" due to ventricular relaxation, "dub" due to atrial relaxation.
B "Lub" due to closure of AV valves, "dub" due to closure of semilunar valves.
C "Lub" due to ventricular contraction, "dub" due to atrial contraction.
D "Lub" due to closure of semilunar valves, "dub" due to closure of AV valves.

Q20. A person with blood group O can receive blood only from a donor with blood group O because:

A O blood has no antigens, so it reacts with all antibodies.
B O blood has both anti-A and anti-B antibodies in its plasma.
C O blood has both A and B antigens, making it incompatible with others.
D O blood lacks Rh factor, making it susceptible to agglutination.

Body Fluids and Circulation — Mock Test

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