Cardiovascular System MCQs

Option A: Increase in heart rate

Option B: Decreased vagal discharge

Option C: Increased sympathetic discharge

Option D: Decrease in blood pressure

Correct Answer: Decrease in blood pressure ✔

Option A: Due to closure of semilunar valves

Option B: Is occasionally split

Option C: Has longer duration than 1st heart sound

Option D: Marks the onset of diastole

Correct Answer: Has longer duration than 1st heart sound ✔

Option A: Act as syncytium

Option B: Has multiple nuclei

Option C: Has gap junctions

Option D: Has branching

Correct Answer: Has multiple nuclei ✔

Option A: AV Valve closes

Option B: When ventricular pressure falls below aortic pressure

Option C: When ventricular pressure falls below atrial pressure

Option D: None of the above

Correct Answer: When ventricular pressure falls below atrial pressure ✔

Option A: Purkinje system

Option B: Bundle of HIS

Option C: Right and left bundle branches

Option D: AV node

Correct Answer: Purkinje system ✔

Option A: Arteries

Option B: Arterioles

Option C: Capillaries

Option D: Venules

Correct Answer: Arterioles ✔

Option A: Chronotropic effect

Option B: Dromotropic effect

Option C: Bathmotropic

Option D: Ionotropic effect

Correct Answer: Ionotropic effect ✔

Option A: Liver

Option B: Brain

Option C: Kidney

Option D: Heart

Correct Answer: Liver ✔

Option A: 0.7 seconds

Option B: 0.3 seconds

Option C: 0.7 seconds

Option D: 0.4 seconds

Correct Answer: 0.4 seconds ✔

Option A: 0.4 seconds

Option B: 0.8 seconds

Option C: 1.2 seconds

Option D: 1.6 seconds

Correct Answer: 0.8 seconds ✔

Option A: Auto regulation

Option B: Hormones

Option C: Parasympathetic impulses

Option D: Sympathetic impulse

Correct Answer: Auto regulation ✔

Option A: AV node

Option B: SA node

Option C: Bundle of His

Option D: Purkinje fibers

Correct Answer: Purkinje fibers ✔

Option A: Isovolumetric contraction

Option B: Isovolumetric relaxation

Option C: Pre-diastole

Option D: Pre-systole

Correct Answer: Isovolumetric relaxation ✔

Option A: cardiac output and body weight

Option B: Cardiac output and body surface area

Option C: Cardiac output and work of the heart

Option D: Stroke volume and pulse rate

Correct Answer: Cardiac output and body surface area ✔

Option A: Increased blood pressure, increased heart rate

Option B: Decreased B.P , decreased heart rate

Option C: Increased B.P, decreased heart rate

Option D: Decreased B.P, increased heart rate

Correct Answer: Decreased B.P , decreased heart rate ✔

Option A: Starling’s law of heart states that increase in force of contraction is directly related to cardiac ouput

Option B: Staling’s law of heart states that the force of ventricular contraction is directly related to the end diastolic volume

Option C: Both A and B

Option D: None of the above

Correct Answer: Both A and B ✔

Option A: Aorta

Option B: Arteries

Option C: Capillaries

Option D: Venules

Correct Answer: Venules ✔

Option A: Venules

Option B: Arterioles

Option C: Capillaries

Option D: Precapillary sphincters

Correct Answer: Arterioles ✔

Option A: Peripheral resistance X tissue fluid

Option B: Peripheral resistance X cardiac rate

Option C: Blood pressure X cardiac rate

Option D: Heart rate X blood volume

Correct Answer: Heart rate X blood volume ✔

Option A: “P” wave

Option B: “Q” wave

Option C: “R” wave

Option D: “T” wave

Correct Answer: D. “T” wave ✔

Option A: SA node decreases firing

Option B: Increased AV node excitability

Option C: Decreased ventricular contraction

Option D: Tachycardia

Correct Answer: SA node decreases firing ✔

Option A: Closure of the pulmonary valve

Option B: Rapid filling of the left ventricle

Option C: Closure of the aortic valve

Option D: Contraction of the atria

Correct Answer: Closure of the aortic valve ✔

Option A: Measures the change in Po2 in arterial blood

Option B: Measures Po2 in venous blood

Option C: Measures the changed in CO2 in arterial blood

Option D: Measures the change in CO2 in venous blood

Correct Answer: Measures the change in Po2 in arterial blood ✔

Option A: Volume of the circulation per minute

Option B: Peripheral vascular resistance

Option C: Pulse Pressure

Option D: Total Capacity

Correct Answer: Volume of the circulation per minute ✔

Option A: 1 to 4 m/sec

Option B: 5 to 8 m/sec

Option C: 9 to 12 m/sec

Option D: More than 12 m/sec

Correct Answer: 1 to 4 m/sec ✔

Option A: Reynolds number < 2000

Option B: Decrease in velocity of blood

Option C: Decrease in density of blood

Option D: Increase in diameter of blood vessel

Correct Answer: Increase in diameter of blood vessel ✔

Option A: Higher filtration pressure

Option B: Lower filtration pressure

Option C: Both of the above

Option D: None

Correct Answer: Higher filtration pressure ✔

Option A: The loudest sound is the diastolic pressure

Option B: Systolic pressure estimation tends to be lower than those make by palpatory method

Option C: The first sound heard is the systolic pressure

Option D: The sounds that are heard are generated in heart

Correct Answer: The first sound heard is the systolic pressure ✔

Option A: Preload

Option B: After load

Option C: Heart rate

Option D: Myocardial contractility

Correct Answer: After load ✔

Option A: is capable of generating impulses

Option B: Has rich sympathetic innervation

Option C: Has poor cholinergic innervation

Option D: Generates impulses at the highest rate

Correct Answer: Generates impulses at the highest rate ✔

Option A: Reflex hyperpnea

Option B: Reflex Hypercapnia

Option C: Reflex tachycardia

Option D: Reflex Hypercapnia

Correct Answer: Reflex Hypercapnia ✔

Option A: Increases heart rate

Option B: Decreases myocardial irritability

Option C: Increases force of contraction

Option D: Increases oxygen uptake by heart

Correct Answer: Decreases myocardial irritability ✔

Option A: Isotonic relaxation

Option B: Isovolumetric relaxation

Option C: Isovolumetric contraction

Option D: Isotonic contraction

Correct Answer: Isovolumetric contraction ✔

Option A: Cardiac efficiency

Option B: Cardiac index

Option C: Mean stroke volume

Option D: Mean arterial pressure

Correct Answer: Mean stroke volume ✔

Option A: 2.5

Option B: 4.25

Option C: 5.25

Option D: 9.5

Correct Answer: 5.25 ✔

Option A: AV node

Option B: SA node

Option C: SA node

Option D: Purkinje fibers

Correct Answer: AV node ✔

Option A: Lasts till cardiac contraction

Option B: Longer than refractory period in skeletal muscle

Option C: A phase of cardiac cycle in which heart cannot be stimulated by any amount of stimulus

Option D: Corresponds with duration of action potential

Correct Answer: All of the above ✔

Option A: Hyperplasia

Option B: Hypertrophy

Option C: Fatty infiltration

Option D: Increased amounts of fibrous connective tissue

Correct Answer: Hypertrophy ✔

Option A: Aorta

Option B: Artery

Option C: Arteriole

Option D: Vein

Correct Answer: Arteriole ✔

Option A: Does not operate in the failing heart

Option B: Does not operate during exercise

Option C: Explains the increase in cardiac output that occurs when venous return is increased

Option D: Explains the increase in cardiac output when the sympathetic nerves supplying the heart stimulated

Correct Answer: Explains the increase in cardiac output that occurs when venous return is increased ✔

Option A: Systolic ejection

Option B: Isovolumetric relaxation

Option C: Isovolumetric contraction

Option D: None of the above

Correct Answer: None of the above ✔

Option A: Heart rate

Option B: Peripheral resistance

Option C: Systolic blood pressure

Option D: Venous return

Correct Answer: Systolic blood pressure ✔

Option A: 30 ml

Option B: 130 ml

Option C: 70 ml

Option D: 5 liters

Correct Answer: 70 ml ✔

Option A: The bundle of His

Option B: All cardiac muscle

Option C: The sinoatrial node

Option D: The cervical ganglion

Correct Answer: The sinoatrial node ✔

Option A: Closure of the aortic and pulmonary valves

Option B: Opening of the aortic and pulmonary valves

Option C: Closure of the mitral and tricuspid valves

Option D: Opening of the mitral and tricuspid valves

Correct Answer: Closure of the mitral and tricuspid valves ✔