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Human Circulatory System and Heart Physiology

Quiz covering the structure and function of the human heart, heart sounds, cardiac innervation, vasodilators, blood clotting, and related circulatory physiology

9 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following statements regarding the innervation of the human heart is false?

  1. Afferent fibres carrying pain sensation run to the spinal cord.
  2. During rest, the vagal tone is recessive.
  3. Postganglionic fibres descend to the heart and form two plexuses.
  4. The effects of autonomic nervous system on coronary artery and blood flow are reciprocal.
  5. Preganglionic sympathetic fibres ascend from the upper five thoracic segments of the spinal cord.
Question 2 Multiple Choice (Single Answer)

Which of the following statements regarding heart sounds is incorrect?

  1. Third heart sound is pathological in children, but physiological in adults.
  2. Turbulent blood flow is a result of stenotic valves or blood vessels.
  3. Heart murmurs are pathological noises that result from abnormal blood flow in the heart or blood vessels.
  4. Heart sounds are a result of a beating heart and resultant blood flow.
  5. In a mammalian heart, the chordae tendinea functions like the strings on a parachute.
Question 3 Multiple Choice (Single Answer)

Which of the following lie(s) in the deepest layer of the endocardium?

  1. Atrioventricular node
  2. Purkinje fibres
  3. Sinoatrial node
  4. Bundle of his
  5. Bundle branch block
Question 4 Multiple Choice (Single Answer)

Which of the following is the commonest cause of anaemia in developing countries?

  1. Autoimmune haemolytic anaemia
  2. Non-Hodgkin's lymphoma
  3. B12 deficiency
  4. Iron deficiency
  5. Drug-induced haemolysis
Question 5 Multiple Choice (Single Answer)

Which of the following does not characterise a mammalian heart?

  1. In a human heart, a single heartbeat lasts for about 0.8 seconds.
  2. The impulses are delayed for about 0.1 s at the bundle of his.
  3. The SA node generates electrical impulses.
  4. Few cardiac cells can contract without any signal from the brain.
  5. The heart is energetically a syncytium.
Question 6 Multiple Choice (Single Answer)

Vasodilators open (dilate) the blood vessels. Which of the following is/are vasodilator(s)?

  1. Atrial natriuretic peptide
  2. Antidiuretic hormone
  3. Epinephrine and norepinephrine
  4. Angiotensin II
  5. Nicotine
Question 7 Multiple Choice (Single Answer)

Which of the following proteins is a protease inhibitor controlling blood clotting in mammals?

  1. Tissue plasminogen activator
  2. Plasmin
  3. Antithrombin
  4. Thrombin
  5. Niacin
Question 8 Multiple Choice (Single Answer)

Which of the following is/are negative chronotropic?

  1. Thyroid hormones
  2. Moderate warming
  3. Sympathetic stimulation
  4. Mild alkalemia
  5. Vagal stimulation
Question 9 Multiple Choice (Single Answer)

Which of the following proteins is a protease of the blood clotting pathway in humans?

  1. Fibrin
  2. Plasminogen
  3. Prothrombin
  4. Factor XII
  5. Factor XIII
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