Physiology Quiz: Muscles and Nervous System
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Questions and Answers

What type of cell is responsible for producing the myelin sheath?

  • Schwann cell (correct)
  • Muscle cell
  • Mitochondria
  • Axoplasm

    • What is a characteristic of the action potential of skeletal muscle?

  • It spreads inwards to all parts of the muscle (correct)
  • It is longer than the action potential of cardiac muscle
  • It is not essential for muscle contraction
  • It has a prolonged plateau phase

    • What is required for contraction in smooth muscle?

  • Monoamine oxidase
  • K+
  • Acetylcholine
  • Calmodulin (correct)

    • What is the role of tropomyosin in skeletal muscle?

    <p>Covering up the actin binding sites of myosin at rest</p> Signup and view all the answers

    How does neostigmine improve muscular weakness?

    <p>It blocks the action of acetylcholine esterase</p> Signup and view all the answers

    How many oxygen molecules are carried by one Hb molecule?

    <p>4</p> Signup and view all the answers

    What is the characteristic of the S.A node that makes it the pacemaker of the heart?

    <p>Its natural leakiness to Na+</p> Signup and view all the answers

    What is the duration of the absolute refractory period in the heart?

    <p>It lasts till cardiac contraction</p> Signup and view all the answers

    During which phase of the cardiac cycle does the first heart sound occur?

    <p>Isovolumetric contraction</p> Signup and view all the answers

    Which of the following vessels does not have sympathetic control?

    <p>Cerebral vessels</p> Signup and view all the answers

    What is the main component of the blood-brain barrier?

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

    What is the effect of stimulating the sympathetic nerves on the heart?

    <p>It produces a positive bathmotropic effect</p> Signup and view all the answers

    What is the primary cause of CO2 bubbles formation?

    <p>Due to increase in barometric pressure</p> Signup and view all the answers

    What is the normal value of FEV1 in an adult?

    <p>80%</p> Signup and view all the answers

    Which gas is most important in maintaining alveolar ventilation?

    <p>Carbon dioxide</p> Signup and view all the answers

    What is the primary indication for hyperbaric oxygen therapy?

    <p>Gas gangrene</p> Signup and view all the answers

    What is the effect of high altitude on alveolar PO2 and PCO2?

    <p>Decrease in PO2, decrease in PCO2</p> Signup and view all the answers

    What is the primary function of surfactant in the lungs?

    <p>To reduce surface tension</p> Signup and view all the answers

    Where is a diastolic murmur typically loudest?

    <p>Apex of the heart</p> Signup and view all the answers

    What causes the 's' wave in ECG to be below the isoelectric line?

    <p>Change in direction of the impulse when the ventricles are getting depolarized</p> Signup and view all the answers

    Which of the following is least likely to cause hypertension?

    <p>Chronically increased secretion of thyroid gland</p> Signup and view all the answers

    What happens to lymph flow from the foot when an individual rises from the supine to standing position?

    <p>It increases</p> Signup and view all the answers

    What determines the pressure in the radial artery?

    <p>The rate of discharge in sympathetic nerve fibers to the arm</p> Signup and view all the answers

    Why is the 'T' wave in ECG above the isoelectric line?

    <p>Change in the direction of repolarization from the wave of depolarization</p> Signup and view all the answers

    What is the effect of negative G on the eye?

    <p>Temporary blinding with redout</p> Signup and view all the answers

    What happens to airway resistance in asthama?

    <p>It increases</p> Signup and view all the answers

    What is the effect of decreased PCO2, decreased H+, and increased PO2 on breathing?

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

    At what tidal volume is the Herring-Breuer inflation reflex activated in human beings?

    <p>Above 1 liter</p> Signup and view all the answers

    What is the characteristic of total vital capacity in scoliosis?

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

    What is the incorrect pairing of enzyme and substrate?

    <p>Erythropeptidase-polypeptides</p> Signup and view all the answers

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