A. Insufficient neurotransmitter
B. Depletion of intracellular Na+
C. Inactivation of Na+ k+ ATPase
D. Voltage inactivation of the Na+ channel
Related Mcqs:
- 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 - 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 - 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 - 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 - The viral action is differentiated from bacterial action by_________________?
A. Interferon production
B. Toxin production
C. Lymphocytes production
D. Neutrophils production - 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 - 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 - Which of the following refractory is used to counteract most of the expansion________________?
A. Quartz
B. Cristobalite
C. Tridymite
D. Corundum - Due fear which of the following hormones increases rapidly _______________?
A. Growth hormones
B. Epinephrine
C. Corticosteroid
D. Thyroid hormone - 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
