Cardiovascular System MCQs

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| By Catherine Halcomb
Catherine Halcomb
Community Contributor
Quizzes Created: 1443 | Total Attempts: 6,686,485
| Attempts: 1,144
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  • 1/15 Questions

    Cardiac Output (C.O.):

    • It is normally expressed as the output of each of the ventricles in liter per minute
    • Is about 2.0 I at rest
    • Is about 10.0 I at rest
    • Rises in a cold environment
    • Does not increase in exercise following denervation of the heart
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About This Quiz

This informative quiz on Cardiovascular system contains wide-ranging questions that will enhance your conceptual knowledge about the cardiovascular system. This quiz will help you in your last-minute revision before the exam, so if you are looking to test your knowledge, this is the quiz for you. If you find this quiz informative was learned something new from it, make sure you share it with your friends and peers. All the best!

Cardiovascular System MCQs - Quiz

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  • 2. 

    The strength of contraction of the left ventricular muscle increases when:

    • End-diastolic ventricular filling pressure rises

    • Serum potassium levels rise

    • Blood calcium levels fall

    • Blood magnesium levels fall

    • Peripheral resistance is decreased

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  • 3. 

    When Parasympaticus is activated, there is:

    • Hypertension

    • Tachycardia

    • Bradycardia

    • Increase in Stroke Volume (SV)

    • None of the above

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  • 4. 

    Sino-atrial node cells are:

    • Found in both atria

    • Innervated by the somatic nerves

    • Unable to generate impulses when completely denervated

    • Connected to the atrioventricular node by fine bundles of Purkinje tissue

    • Able to self-generate impulses because their membrane potential is unstable

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  • 5. 

    In a denervated heart, the left ventricular stroke volume increases when the:

    • End-diastole length of the ventricular fiber increases

    • Peripheral resistance decreases

    • Blood volume falls

    • Right ventricular output decreases.

    • Veins dilate

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  • 6. 

    In the brachial artery:

    • Pulse waves travel at the same velocity as blood

    • Pulse pressure falls with decreasing elasticity of the wall

    • Pressure rises markedly when the artery is occluded distally

    • Pressure falls when the arm is raised above a head level

    • Pulse pressures have a smaller amplitude than aortic pulse pressures

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  • 7. 

    The heart rate is decreased when:

    • Atropine is injected

    • Vagus is stimulated

    • Glucocorticoids are injected

    • Ca2+ is applied

    • Adrenaline is injected

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  • 8. 

    The greater the distance from the heart is, the arterial:

    • Walls contain relatively more smooth muscle fibers than elastic

    • Flow has a greater tendency to be turbulent

    • Mean pressure tends to decrease slightly

    • Pulse pressure tends to increase slightly

    • PO2 falls appreciably

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  • 9. 

    The main factor determining the diastolic blood pressure is:

    • The volume of blood

    • Viscosity of blood

    • Cardiac performance

    • Peripheral vascular resistance

    • The length of the blood vessel

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  • 10. 

    The absolute refractory period in the heart:

    • Corresponds to the duration of relaxation

    • Lasts ti11 half of cardiac contraction

    • Is shorter than the refractory period in skeletal muscle

    • Lasts till the end of the first third of cardiac relaxation

    • Last only 10 ms

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  • 11. 

    Systemic hypertension may be caused by:

    • Hypoxia due to chronic respiratory failure

    • The excessive secretion of aldosterone

    • Excessive secretion of insulin

    • Myocardial thickening (hypertrophy) of the left ventricle

    • The rapid cardiac action of ventricular fibrillation

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  • 12. 

    The first heart sound corresponds in time with:

    • Closure of the aortic and pulmonary valves

    • The P wave of the electrocardiogram

    • A decline in atrial pressure

    • A rise in ventricular pressure

    • The A wave in central venous pressure

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  • 13. 

    From a functional point of view, arterioles:

    • Allow exchange of water, salts, electrolytes, hormones, and other substances between plasma and tissues in both directions

    • Contraction is a bigger part of the blood volume

    • Decrease the big fluctuations in blood plasma during the cardiac cycle

    • Form the resistance against the ventricular contractions

    • Play the role of reservoirs of blood from the capillaries

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  • 14. 

    Ln atrial fibrillation:

    • The electrocardiogram shows no evidence of atrial activity

    • The ventricular rate is lower than the atrial rate

    • Respiratory sinus arrhythmia can usually be registered

    • The ventricular rate is higher than the atrial rate

    • The QRS complex has an abnormal configuration

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  • 15. 

    Hyperemia in skeletal muscle during exercise is normally associated with: 

    • Release of sympathetic vasoconstrictor tone in the exercising muscles

    • Capillary dilation clue to relaxation or capillary smooth muscle

    • A fall in arterial pressure·

    • Reflex vasoconstriction in other vascular beds

    • An increase in venous pressure

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Quiz Review Timeline (Updated): Nov 16, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Nov 16, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 20, 2023
    Quiz Created by
    Catherine Halcomb
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