Circulatory Disorders — NEET Biology MCQs with Solutions
Free NEET Biology Circulatory Disorders MCQs with step-by-step solutions (32 questions). Part of Body Fluids and Circulation. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Circulatory Disorders · easy · theory
Persistently high blood pressure (e.g. above 140/90 mmHg) is called:
A. Hypertension ✓ Correct
B. Anaemia
C. Hypotension
D. Angina
Solution: Hypertension is high blood pressure (normal ≈ 120/80 mmHg), a major risk factor for heart disease.
Q2 — Circulatory Disorders · easy · theory
Chest pain due to insufficient oxygen reaching the heart muscle is called:
A. Oedema
B. Hypertension
C. Angina (pectoris) ✓ Correct
D. Leukaemia
Solution: Angina pectoris is acute chest pain from inadequate oxygen supply to the myocardium.
Q3 — Circulatory Disorders · medium · theory
The deposition of calcium, fat and fibrous tissue narrowing the arteries is called:
A. Anaemia
B. Thrombosis of lymph
C. Atherosclerosis ✓ Correct
D. Arteriosclerosis of veins
Solution: Atherosclerosis narrows/hardens arteries, raising blood pressure and risk of coronary artery disease.
Q4 — Circulatory Disorders · medium · theory
Coronary Artery Disease (CAD) affects the vessels that supply blood to the:
A. Kidneys
B. Lungs
C. Brain
D. Heart muscle (myocardium) ✓ Correct
Solution: CAD (atherosclerosis) narrows the coronary arteries that supply the heart muscle itself.
Q5 — Circulatory Disorders · hard · theory
A "heart attack" (myocardial infarction) occurs when:
A. The heart beats too slowly
B. The valves leak slightly
C. Blood supply to a part of the heart muscle is blocked, causing muscle death ✓ Correct
D. Blood pressure drops suddenly
Solution: A blocked coronary artery deprives cardiac muscle of oxygen, causing its death (infarction).
Q6 — Circulatory Disorders · hard · theory
The normal human blood pressure is about ______; the higher value represents ______ pressure:
A. 120/80 mmHg; systolic ✓ Correct
B. 80/120 mmHg; diastolic
C. 100/60 mmHg; systolic
D. 140/100 mmHg; diastolic
Solution: Normal BP ≈ 120/80 mmHg — 120 (systolic, ventricular contraction) over 80 (diastolic, relaxation).
Q7 — Circulatory Disorders · easy · numerical
A person repeatedly records a blood pressure of 150/95 mm Hg. This condition is termed:
A. Normal blood pressure
B. Hypotension (low blood pressure)
C. Angina pectoris
D. Hypertension (high blood pressure) ✓ Correct
Solution: A sustained BP of 140/90 mm Hg or higher is classed as hypertension; 150/95 clearly exceeds this threshold.
Q8 — Circulatory Disorders · easy · numerical
The symptom of acute chest pain that appears when the heart muscle does not receive enough oxygen-rich blood is called:
A. Angina pectoris ✓ Correct
B. Leukaemia
C. Atherosclerosis
D. Erythroblastosis
Solution: Angina pectoris is the chest pain resulting from inadequate oxygen supply to the myocardium, often when coronary flow is reduced.
Q9 — Circulatory Disorders · easy · numerical
Deposition of calcium, fat, cholesterol, and fibrous tissue that narrows and hardens the arteries is known as:
A. Thrombocytopenia
B. Atherosclerosis ✓ Correct
C. Hypertension
D. Anaemia
Solution: Atherosclerosis is the build-up of calcium, fat, cholesterol, and fibrous tissue in the arterial walls, narrowing the lumen and reducing blood flow.
Q10 — Circulatory Disorders · easy · numerical
Coronary artery disease (CAD) is dangerous primarily because the affected vessels:
A. Drain deoxygenated blood from the brain
B. Connect the two atria of the heart
C. Carry blood only to the kidneys
D. Supply blood to the heart muscle itself ✓ Correct
Solution: CAD affects the coronary arteries that nourish the cardiac muscle; their narrowing starves the myocardium of oxygen, which can lead to angina or a heart attack.
Q11 — Circulatory Disorders · medium · numerical
Assertion (A): A myocardial infarction is commonly called a heart attack. Reason (R): It occurs when blood supply to a part of the heart muscle is suddenly blocked, damaging that tissue. Choose the correct option.
A. A is false but R is true
B. A is true but R is false
C. Both A and R are true and R is the correct explanation of A ✓ Correct
D. Both A and R are true but R is not the correct explanation of A
Solution: A myocardial infarction (heart attack) results from a sudden blockage of blood flow to part of the heart muscle, causing that region to be damaged — so R correctly explains A.
Q12 — Circulatory Disorders · medium · numerical
Which sequence best represents how untreated risk factors can progress to a heart attack?
A. Hypertension → increased plasma albumin → wider arteries → infarction
B. Angina → erythroblastosis → atherosclerosis → infarction
C. Atherosclerosis → narrowed coronary arteries → reduced oxygen to myocardium → myocardial infarction ✓ Correct
D. Myocardial infarction → atherosclerosis → hypertension → angina
Solution: Atherosclerotic deposits narrow the coronary arteries, cutting oxygen delivery to the heart muscle; if a vessel is blocked, the muscle dies — a myocardial infarction.
Q13 — Circulatory Disorders · medium · numerical
For a blood pressure reading of 120/80 mm Hg, which statement is correct?
A. 120 is the systolic pressure during ventricular contraction and 80 is the diastolic pressure during relaxation ✓ Correct
B. Both numbers represent pressures in the veins
C. 120 is the diastolic pressure and 80 is the systolic pressure
D. 120 is measured in the right atrium and 80 in the left atrium
Solution: In a BP reading the higher figure (120) is the systolic pressure during ventricular systole and the lower figure (80) is the diastolic pressure during ventricular diastole.
Q14 — Circulatory Disorders · medium · numerical
Which of the following statements about circulatory disorders is INCORRECT?
A. Atherosclerosis reduces the elasticity and lumen of arteries
B. Hypertension can eventually damage the heart, brain, and kidneys
C. Coronary artery disease can predispose a person to a heart attack
D. Angina pectoris permanently kills a portion of the heart muscle by itself ✓ Correct
Solution: Angina is pain from temporary oxygen shortage and does not itself cause permanent muscle death; that is a myocardial infarction. The other statements are correct.
Q15 — Circulatory Disorders · medium · numerical
Match the disorder with its defining feature and choose the correct set: (i) Hypertension (ii) Angina (iii) Atherosclerosis — (p) chest pain from inadequate myocardial oxygen (q) hardening and narrowing of arteries by deposits (r) blood pressure persistently at or above 140/90 mm Hg.
A. i-r, ii-q, iii-p
B. i-q, ii-r, iii-p
C. i-p, ii-q, iii-r
D. i-r, ii-p, iii-q ✓ Correct
Solution: Hypertension is persistently high BP (≥140/90), angina is chest pain from poor myocardial oxygenation, and atherosclerosis is the hardening/narrowing of arteries by deposits.
Q16 — Circulatory Disorders · medium · numerical
Why is chronic hypertension often called a "silent" but serious condition?
A. It raises plasma protein levels and improves circulation
B. It only affects blood pressure during sleep and is harmless
C. It always produces severe chest pain immediately
D. It may show no obvious symptoms yet steadily damages the heart, arteries, and other organs ✓ Correct
Solution: Hypertension frequently produces no noticeable symptoms while progressively straining the heart and damaging arteries, the brain, and the kidneys — hence "silent" yet dangerous.
Q17 — Circulatory Disorders · easy
In adult, normal blood pressure is
A. 120/80 mmHg ✓ Correct
B. 80/120 mmHg
C. 100/120 mmHg
D. 100/80 mmHg
Solution: Normal adult blood pressure is about 120/80 mmHg (systolic/diastolic).
Q18 — Circulatory Disorders · easy
Normal BP = 120/80 mmHg in an adult. In this measurement 120 mmHg is the ____ pressure and 80 mmHg is ____ pressure
A. Pulse, systolic
B. Diastolic, systolic
C. Pulse, diastolic
D. Systolic, diastolic ✓ Correct
Solution: 120 mmHg is the systolic pressure and 80 mmHg is the diastolic pressure.
Q19 — Circulatory Disorders · easy
Which one indicates high B.P or hypertension?
A. 140/90 mmHg or higher ✓ Correct
B. 80/120 mmHg
C. 40/60 mmHg
D. 120/80 mmHg
Solution: Blood pressure of 140/90 mmHg or higher indicates hypertension.
Q20 — Circulatory Disorders · medium
It is often referred as atherosclerosis, affects the blood vessels that supply blood to the heart muscles. It is caused by deposition of Ca, fat, cholesterol and fibrous tissues making the lumen of arteries narrow. The above facts are related to -
A. Blue baby
B. SCIO
C. CAD ✓ Correct
D. Heart arrest
Solution: Narrowing of coronary arteries by deposits (atherosclerosis) describes coronary artery disease (CAD).
Q21 — Circulatory Disorders · hard
Assertion - Nitroglycerin relieves chest pain caused by narrowing of the cardiac arteries. Reason - The chest pain results from inadequate blood flow in coronary arteries. Vasodilation promoted by nitric oxide from nitroglycerin increases blood flow, providing the heart muscle with additional oxygen and thus relieving the pain.
A. Both assertion and reason are true but reason is not correct explanation of assertion.
B. Assertion is true but reason is false.
C. Both assertion and reason are true and reason is correct explanation of assertion. ✓ Correct
D. Both assertion and reason are false.
Solution: Nitroglycerin releases nitric oxide, causing vasodilation that increases coronary blood flow and oxygen to the heart, relieving anginal pain; the reason explains the assertion.
Q22 — Circulatory Disorders · medium
Which one of the following statements is correct regarding blood pressure?
A. 130/90 mmHg is considered high and requires treatment.
B. 100/55 mmHg is considered as an ideal blood pressure.
C. 190/110 mmHg may harm vital organs like brain and kidney. ✓ Correct
D. 105/50 mmHg makes one very active.
Solution: A blood pressure of 190/110 mmHg is severe hypertension that can damage vital organs such as the brain and kidney.
Q23 — Circulatory Disorders · medium
Assertion (A): Coronary Artery Disease (CAD) makes the lumen of arteries narrower. Reason (R): CAD is caused by deposits of calcium, fat, cholesterol, and fibrous tissues.
A. Assertion (A) is false, but Reason (R) is true.
B. Assertion (A) is true, but Reason (R) is false.
C. Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A). ✓ Correct
D. Both Assertion (A) and Reason (R) are true, but (R) is not the correct explanation of (A).
Solution: CAD narrows the arterial lumen because of deposits of calcium, fat, cholesterol, and fibrous tissues, so R explains A.
Q24 — Circulatory Disorders · hard
Assertion (A): Heart failure is the same as cardiac arrest. Reason (R): In heart failure, the heart is not pumping blood effectively enough to meet the body's needs.
A. Assertion (A) is false, but Reason (R) is true. ✓ Correct
B. Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
C. Assertion (A) is true, but Reason (R) is false.
D. Both Assertion (A) and Reason (R) are true, but (R) is not the correct explanation of (A).
Solution: Heart failure is not the same as cardiac arrest (in which the heart stops beating), so A is false, but the definition of heart failure in R is true.
Q25 — Circulatory Disorders · hard
Statement I: Erythroblastosis foetalis can be avoided by administering anti-Rh antibodies to the mother immediately after the delivery of the first child. Statement II: This condition occurs when the mother is Rh+ve and the foetus is Rh-ve.
A. Both Statement I and Statement II are correct.
B. Neither Statement I nor Statement II is correct.
C. Only Statement II is correct.
D. Only Statement I is correct. ✓ Correct
Solution: Anti-Rh antibodies given after the first delivery prevent the disease, but it occurs when the mother is Rh-ve and foetus Rh+ve, so only Statement I is correct.
Q26 — Circulatory Disorders · hard
Statement I: Hypertension is defined as repeated blood pressure checks of 140/90 or higher. Statement II: In a 120/80 measurement, 120 mm Hg is the diastolic pressure.
A. Neither Statement I nor Statement II is correct.
B. Only Statement II is correct.
C. Both Statement I and Statement II are correct.
D. Only Statement I is correct. ✓ Correct
Solution: Hypertension is 140/90 or higher, but in 120/80 the 120 mm Hg is systolic (not diastolic), so only Statement I is correct.
Q27 — Circulatory Disorders · hard
Statement I: Angina pectoris occurs when not enough oxygen is reaching the heart muscle. Statement II: Heart failure is the same as cardiac arrest where the heart stops beating.
A. Only Statement I is correct. ✓ Correct
B. Only Statement II is correct.
C. Both Statement I and Statement II are correct.
D. Neither Statement I nor Statement II is correct.
Solution: Angina results from inadequate oxygen to the heart muscle, but heart failure differs from cardiac arrest, so only Statement I is correct.
Q28 — Circulatory Disorders · easy
Symptoms of Hypertension include:
(i) Pressure of 140/90 or higher.
(ii) Affects vital organs like brain and kidney.
(iii) Leads to heart disease.
A. (i) and (iii)
B. (ii) and (iii)
C. All are correct ✓ Correct
D. (i) and (ii)
Solution: All three statements about hypertension are correct.
Q29 — Circulatory Disorders · medium
Identify the incorrect statements:
(i) Heart failure is the same as cardiac arrest.
(ii) Angina is chest pain due to low oxygen supply to heart muscles.
(iii) Atherosclerosis is caused by deposits of calcium and fat.
A. (i) only ✓ Correct
B. (iii) only
C. (ii) only
D. (i) and (iii)
Solution: Only (i) is incorrect because heart failure is not the same as cardiac arrest; (ii) and (iii) are correct.
Q30 — Circulatory Disorders · hard
Analyze statements about Erythroblastosis foetalis:
(i) It occurs during the first pregnancy of an Rh-ve mother.
(ii) It results in severe anemia and jaundice in the baby.
(iii) It can be avoided by giving anti-Rh antibodies to the mother immediately after delivery of the first child.
A. (ii) and (iii) ✓ Correct
B. (i) and (iii)
C. All are correct
D. (i) and (ii)
Solution: (ii) and (iii) are true; (i) is false because it usually does not affect the first pregnancy.