Cardiovascular System Function Quiz
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Questions and Answers

What is the main function of the circulatory system?

  • Transport of gases and waste products
  • Regulation of body temperature by controlling blood flow to the skin
  • Defense mechanism by transporting leukocytes and antibodies
  • All of the above (correct)

    • Which division of the circulatory system involves the flow of blood from the left ventricle to the aorta, large arteries, arterioles, and capillaries?

  • Coronary circulation
  • Peripheral circulation
  • Systemic circulation (correct)
  • Pulmonary circulation

    • What is the function of pulmonary circulation?

  • Regulation of body temperature
  • Gas exchange (correct)
  • Transport of nutrients to the tissues
  • Defense mechanism against infections

    • Where does the blood flow in pulmonary circulation?

    <p>From the right atrium to the right ventricle then through the pulmonary artery to the lungs</p> Signup and view all the answers

    What does the transport function of the circulatory system include?

    <p>Transport of O2, CO2, and waste products to and from tissues</p> Signup and view all the answers

    How does the circulatory system contribute to maintaining homeostasis?

    <p>By controlling blood flow to the skin</p> Signup and view all the answers

    What is the function of the atrial muscles?

    <p>To regulate arterial blood pressure</p> Signup and view all the answers

    Which valve separates the right atrium from the right ventricle?

    <p>Tricuspid valve</p> Signup and view all the answers

    What is the main function of the semilunar valves?

    <p>To allow one-way flow of blood from the ventricles to the aorta and pulmonary arteries</p> Signup and view all the answers

    What is the absolute refractory period (A.R.P) of the cardiac muscle?

    <p>The period during which excitability is completely lost, and any stimulus cannot excite the cardiac muscle</p> Signup and view all the answers

    Which chamber of the heart receives blood from the body through superior and inferior vena cava?

    <p>Right atrium</p> Signup and view all the answers

    What is excitability in relation to cardiac muscle?

    <p>The ability to respond to a stimulus and generate an action potential</p> Signup and view all the answers

    What is the left ventricle's wall thickness compared to the right?

    <p>Thicker by three times than right ventricle's wall.</p> Signup and view all the answers

    When does mechanical contraction of cardiac muscle start?

    <p>At the end of plateau phase</p> Signup and view all the answers

    What is the function of the tricuspid valve in the heart?

    <p>Receives blood from the body through superior and inferior vena cava</p> Signup and view all the answers

    During which phase of the cardiac cycle does mechanical contraction (systole) of the cardiac muscle start?

    <p>Depolarization phase</p> Signup and view all the answers

    What happens during the relative refractory period (RRP) of the cardiac muscle?

    <p>Excitability is decreased</p> Signup and view all the answers

    What is the main function of the circulatory system?

    <p>All of the above</p> Signup and view all the answers

    Which chamber of the heart pumps blood to the aorta to reach different organs of the body?

    <p>Left ventricle</p> Signup and view all the answers

    What is the relation between mechanical response and action potential in the cardiac muscle?

    <p>Mechanical response lasts 1.5 times as long as the duration of action potential</p> Signup and view all the answers

    During which phase of the cardiac cycle does the supernormal phase of excitability coincide?

    <p>Second half of diastole</p> Signup and view all the answers

    Which fibers are responsible for conducting the electrical signal generated by the sinoatrial node (SAN)?

    <p>Sinoatrial node (SAN), atrioventricular node (A.V.N), and purkinje fibers</p> Signup and view all the answers

    What is the speed of transmission in the atrioventricular node (A.V. N)?

    <p>$0.02-0.03$ meters/sec</p> Signup and view all the answers

    What is the physiological importance of the atrioventricular nodal delay?

    <p>Gives a chance for complete ventricular repolarization and adequate ventricular filling</p> Signup and view all the answers

    Which factor directly affects the force of myocardial contraction according to Starling's Law?

    <p>Initial length of cardiac muscle fibers</p> Signup and view all the answers

    What is the period during which the ventricles contract and force blood out into the aorta and main pulmonary artery called?

    <p>Systole</p> Signup and view all the answers

    What is the volume of blood pumped by each ventricle per minute known as?

    <p>Cardiac output (C.O.P)</p> Signup and view all the answers

    What is the function of xanthines like caffeine and theophylline?

    <p>Decrease the rate of cAMP breakdown</p> Signup and view all the answers

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