What Do You Know About Cardiac Physiology? Trivia Quiz

25 Questions | Total Attempts: 720

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Physiology Quizzes & Trivia

As we continue to revise on the upcoming cardio physiology exam, I have prepared the part two of block three quizzes as expected. Give it a shot and be sure to come back for the third part as we draw nearer to the finals. Ensure that you send it out to the rest of your classmates. All the best and keep a lookout.


Questions and Answers
  • 1. 
    Which of the following has the highest total cross-sectional area in the body?
    • A. 

      Arteries

    • B. 

      Arterioles

    • C. 

      Capillaries

    • D. 

      Venules

    • E. 

      Veins

  • 2. 
    Which of the following does not occur as blood passes through the systemic capillaries?
    • A. 

      Its hematocrit increases

    • B. 

      Its hemoglobin dissociation curve shift to the left

    • C. 

      Its protein content increases

    • D. 

      Its pH decreases

    • E. 

      Its red blood cells increase in size

  • 3. 
    The velocity of blood flow
    • A. 

      Is higher in the capillaries than the arterioles

    • B. 

      Is higher in the veins than in the venules

    • C. 

      Is higher in the veins than the arteries

    • D. 

      Falls to zero in the descending aorta during diastole

    • E. 

      Is reduced in a constricted area of a blood vessel

  • 4. 
    When the radius of the resistance vessels is increased, which of the following is increased?
    • A. 

      Systolic blood pressure

    • B. 

      Diastolic blood pressure

    • C. 

      Viscosity of the blood

    • D. 

      Hematocrit

    • E. 

      Capillary blood flow

  • 5. 
    When the viscosity of the blood is increased, which of the following is increased?
    • A. 

      Mean blood pressure

    • B. 

      Radius of the resistance vessels

    • C. 

      Radius of the capacitance vessels

    • D. 

      Central venous pressure

    • E. 

      Capillary blood flow

  • 6. 
    Lymph flow from the foot is
    • A. 

      Increased when an individual rises from the supine to the standing position

    • B. 

      Increased by massaging the foot

    • C. 

      Increased when capillary permeability is decreased

    • D. 

      Decreased when the valves of the leg veins are incompetent

    • E. 

      Decreased by exercise

  • 7. 
    Vasopressin secretion is increased by
    • A. 

      Increased pressure in the right ventricle

    • B. 

      Decreased pressure in the right ventricle

    • C. 

      Increased pressure in the right atrium

    • D. 

      Decreased pressure in the right atrium

    • E. 

      Increased pressure in the aorta

  • 8. 
    Catecholamines acting on a-adrenergic receptors
    • A. 

      Increase the contractility of cardiac muscle

    • B. 

      Increase the rate of discharge of the sinoatrial node

    • C. 

      Increase cardiac output

    • D. 

      Constrict coronary arteries by a direct action on these blood vessels

    • E. 

      Dilate blood vessels in skeletal muscle

  • 9. 
    Which of the following would be expected to raise blood pressure?
    • A. 

      Prostacyclin

    • B. 

      A drug that inhibits an angiotensin II-converting enzyme

    • C. 

      A drug that inhibits NO synthase

    • D. 

      A drug that inhibits V1 vasopressin receptors

    • E. 

      A drug that inhibits endothelin-converting enzyme

  • 10. 
    The pressure differential between the heart and the aorta is least in the
    • A. 

      Left ventricle during systole

    • B. 

      Left ventricle during diastole

    • C. 

      Right ventricle during systole

    • D. 

      Right ventricle during diastole

    • E. 

      Left atrium during systole

  • 11. 
    Which of the following organs has the greatest blood flow per 100 g of tissue?
    • A. 

      Brain

    • B. 

      Heart muscle

    • C. 

      Skin

    • D. 

      Liver

    • E. 

      Kidneys

  • 12. 
    Which of the following organs has the most permeable capillaries?
    • A. 

      Brain

    • B. 

      Posterior pituitary gland

    • C. 

      Liver

    • D. 

      Small intestine

    • E. 

      Kidneys

  • 13. 
    Which of the following does not dilate arterioles in the skin?
    • A. 

      Increased body temperature

    • B. 

      Epinephrine

    • C. 

      Bradykinin

    • D. 

      Substance P

    • E. 

      Vasopressin

  • 14. 
    Which of the following is not increased during isotonic exercise?
    • A. 

      Respiratory rate

    • B. 

      Stroke volume

    • C. 

      Heart rate

    • D. 

      Total peripheral resistance

    • E. 

      Systolic blood pressure

  • 15. 
    Which of the following would you expect to decrease in a normal individual who stands quietly in the same position for 1 hour?
    • A. 

      Hematocrit

    • B. 

      Diameter of the thigh

    • C. 

      Plasma renin activity

    • D. 

      Plasma vasopressin concentration

    • E. 

      Central venous pressure

  • 16. 
    An acute decrease in arterial blood pressure elicits which of the following compensatory changes?
    • A. 

      Decreased firing rate of the carotid sinus nerve

    • B. 

      Increased parasympathetic outflow to the heart

    • C. 

      Decreased heart rate

    • D. 

      Decreased contractility

    • E. 

      Decreased mean systemic pressure

  • 17. 
    During which phase of the cardiac cycle is aortic pressure highest?
    • A. 

      Atrial systole

    • B. 

      Isovolumetric ventricular contraction

    • C. 

      Rapid ventricular ejection

    • D. 

      Reduced ventricular ejection

    • E. 

      Isovolumetric ventricular relaxation

  • 18. 
    Myocardial contractility is best correlated with the intracellular concentration of
    • A. 

      Na+

    • B. 

      K+

    • C. 

      Ca2+

    • D. 

      C1-

    • E. 

      Mg2+

  • 19. 
    Carbon dioxide (CO2) regulates blood flow to which one of the following organs?
    • A. 

      Heart

    • B. 

      Skin

    • C. 

      Brain

    • D. 

      Skeletal muscle at rest

    • E. 

      Skeletal muscle during exercise

  • 20. 
    Which receptor is blocked when propranolol is administered to reduce cardiac output?
    • A. 

      A1 receptors

    • B. 

      B1 receptors

    • C. 

      B2 receptors

    • D. 

      Muscarinic receptors

    • E. 

      Nicotinic receptors

  • 21. 
    Which of the following changes will cause an increase in myocardial O2 consumption?
    • A. 

      Decreased aortic pressure

    • B. 

      Decreased heart rate

    • C. 

      Decreased contractility

    • D. 

      Increased size of the heart

    • E. 

      Increased influx of Na+ during the upstroke of the action potential

  • 22. 
    Propranolol has which of the following effects?
    • A. 

      Decreases heart rate

    • B. 

      Increases left ventricular ejection fraction

    • C. 

      Increases stroke volume

    • D. 

      Decreases splanchnic vascular resistance

    • E. 

      Decreases cutaneous vascular resistance

  • 23. 
    Which of the following agents or changes has a negative inotropic effect on the heart?
    • A. 

      Increased heart rate

    • B. 

      Sympathetic stimulation

    • C. 

      Norepinephrine

    • D. 

      Acetylcholine (ACh)

    • E. 

      Cardiac glycosides

  • 24. 
    The low-resistance pathways between myocardial cells that allow for the spread of action potentials are the
    • A. 

      Gap junctions

    • B. 

      T tubules

    • C. 

      Sarcoplasmic reticulum (SR)

    • D. 

      Intercalated disks

    • E. 

      Mitochondria

  • 25. 
    Which agent is released or secreted after a hemorrhage and causes an increase in renal Na+ reabsorption?
    • A. 

      Aldosterone

    • B. 

      Angiotensin I

    • C. 

      Angiotensin II

    • D. 

      Antidiuretic hormone (ADH)

    • E. 

      Atrial natriuretic peptide