The absolute refractory period of an action potential is due to _______________?

Related Mcqs:

1. Absolute refractory period in heart______________?

   A. Lasts till cardiac contraction
   B. Longer than refractory period in skeletal muscle
   C. A phase of cardiac cycle in which heart cannot be stimulated by any amount of stimulus
   D. Corresponds with duration of action potential
   E. All of the above

2. Upstroke of action potential would lead to________________?

   A. Net current in an outward direction
   B. Cell interior becomes more negative
   C. Cell interior becomes less negative
   D. None of the above

3. In nerve , the magnitude of the action potential overshoot is normally a function of the______________?

   A. Magnitude of the stimulus
   B. Intracellular potassium concentration
   C. extracellular sodium concentration
   D. resting membrane potential

4. Absolute period when whole heart is in diastole is______________?

   A. 0.7 seconds
   B. 0.3 seconds
   C. 0.7 seconds
   D. 0.4 seconds

5. The viral action is differentiated from bacterial action by_________________?

   A. Interferon production
   B. Toxin production
   C. Lymphocytes production
   D. Neutrophils production

6. Contraceptive action of combined pill is mainly due to_______________?

   A. Decrease in tubal motility
   B. Prevents the fertilization
   C. Prevents the implantation of fertilized egg
   D. Inhibits ovulation

7. Precancerous potential in plummer-vinson’s syndrome may be due to change in the epithelium like_____________?

   A. Atrophy
   B. Hypertrophy
   C. Acanthosis
   D. All of the above

8. Which of the following refractory is used to counteract most of the expansion________________?

   A. Quartz
   B. Cristobalite
   C. Tridymite
   D. Corundum

9. Due fear which of the following hormones increases rapidly _______________?

   A. Growth hormones
   B. Epinephrine
   C. Corticosteroid
   D. Thyroid hormone

10. The normal absolute eosinophil count is_____________?

    A. 40 to 440 cells/C.mm
    B. 500 to 900 cells/C.mm
    C. 1200 to1500cells/C.mm
    D. 1500 to 2,000cells/C.mm