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81. Fastest conducting tissue in human heart _________________?
A. AV node
B. SA node
C. Bundle of His
D. Purkinje fibers

82. Closure of aortic valve occurs before the following event_______________?
A. Isovolumetric contraction
B. Isovolumetric relaxation
C. Pre-diastole
D. Pre-systole

83. Cardiac index is related to ______________?
A. cardiac output and body weight
B. Cardiac output and body surface area
C. Cardiac output and work of the heart
D. Stroke volume and pulse rate

84. Stimulation of baroreceptor leads to ________________?
A. Increased blood pressure, increased heart rate
B. Decreased B.P , decreased heart rate
C. Increased B.P, decreased heart rate
D. Decreased B.P, increased heart rate

85. Consider the following statements________________?
A. Starling’s law of heart states that increase in force of contraction is directly related to cardiac ouput
B. Staling’s law of heart states that the force of ventricular contraction is directly related to the end diastolic volume
C. Both A and B
D. None of the above

86. Minimum blood pressure is in_____________?
A. Aorta
B. Arteries
C. Capillaries
D. Venules

87. The largest function of the total peripheral resistance is due to _________________?
A. Venules
B. Arterioles
C. Capillaries
D. Precapillary sphincters

88. Pain sensation from the lateral extremities is transmitted by________________?
A. Spino thalmamic tract
B. Dorsal column
C. Corticospinal tract
D. Spinocerebellar tract

89. Pain is conducted by________________?
A. A-alpha fibers
B. A-beta fibers
C. A-gamma fibers
D. A-delta fibers

90. Stimulation of baroreceptors results in_______________?
A. Increase in heart rate
B. Decreased vagal discharge
C. Increased sympathetic discharge
D. Decrease in blood pressure