Human Physiology Quiz
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Questions and Answers

What factor determines the continuous blood flow in the capillaries?

  • Elasticity of the aorta and arteries (correct)
  • Red blood cell count
  • Presence of valves in the veins
  • Large mass of circulating blood
  • What is the volume of blood flowing through the cross-section of a vessel per unit time directly proportional to?

  • Pressure differences at the beginning and end of the vessel (correct)
  • Blood pressure at the end of the vessel
  • Force of heart contraction
  • Viscosity of blood in the vessel
  • Which of the following changes in functional parameters is involved in arteriolar dilatation and a decrease in blood pressure?

  • Increased oxygen in the blood
  • Increased tone of the sympathetic system
  • Decreased tone of the sympathetic system (correct)
  • Increased tone of the parasympathetic system
  • Which of the following does not affect blood pressure?

    <p>Number of leukocytes in the blood</p> Signup and view all the answers

    What is the primary factor that determines blood flow through a vessel?

    <p>Resistance of the vessel to blood flow</p> Signup and view all the answers

    Which of the following is a factor that reduces the linear speed of blood flow?

    <p>Blood viscosity</p> Signup and view all the answers

    What is the primary factor that determines the rhythmic nature of the heart?

    <p>Anatomy of the sinus node</p> Signup and view all the answers

    Which hormone serves as the first line of defense in reducing blood pressure caused by blood loss?

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

    What is the primary factor that determines blood pressure?

    <p>Venous return</p> Signup and view all the answers

    What causes continuous blood flow in the vessels despite pulsatile systolic ejection?

    <p>Elasticity of the aorta and large arteries</p> Signup and view all the answers

    What type of blood vessels create the general resistance of the bloodstream?

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

    What is the term for the ability of the heart muscle to contract according to the amount of blood it contains?

    <p>Starling's law</p> Signup and view all the answers

    What are the normal limits of blood pressure fluctuations in healthy people according to the World Health Organization (WHO)?

    <p>90/60-139/89</p> Signup and view all the answers

    What is the lowest linear blood flow velocity typically found in?

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

    What is the typical systolic volume (SV) and minute volume of blood circulation (MCV) at rest?

    <p>60-80ml, 4-5l</p> Signup and view all the answers

    How does the pressor section of the vasomotor center (VDC) mediate its effect on blood vessels?

    <p>activation of the spinal centers of the sympathetic nervous system</p> Signup and view all the answers

    During depolarization of a myocardial action potential, what is the nature of excitability?

    <p>increased excitability</p> Signup and view all the answers

    What is the reason for the dicrotic rise on a sphygmogram?

    <p>ventricular contractions</p> Signup and view all the answers

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