Medical MCQs

5099 MCQs  (Page 487 of 510)

Stimulation of baroreceptors results in_______________?
A. Increase in heart rate
B. Decreased vagal discharge
C. Increased sympathetic discharge
D. Decrease in blood pressure
Pain is conducted by________________?
A. A-alpha fibers
B. A-beta fibers
C. A-gamma fibers
D. A-delta fibers
Pain sensation from the lateral extremities is transmitted by________________?
A. Spino thalmamic tract
B. Dorsal column
C. Corticospinal tract
D. Spinocerebellar tract
Isovolumetric relaxation ends immediately after________________?
A. Av valve closes
B. When ventricular pressure falls below aortic pressure
C. When ventricular pressure falls below atrial pressure
D. None of the above
Heart muscle, true are all except_______________?
A. Act as syncytium
B. Has multiple nuclei
C. Has gap junctions
D. Has branching
Cardiac cycle duration in man is_______________?
A. 0.4 seconds
B. 0.8 seconds
C. 1.2 seconds
D. 1.6 seconds
Effect on force of contraction of heart is_____________?
A. Chronotropic effect
B. Dromotropic effect
C. Bathmotropic
D. Ionotropic effect