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71. The dicrotic notch on the aortic pressure curve is caused by_________________?
A. Closure of the pulmonary valve
B. Rapid filling of the left ventricle
C. Closure of the aortic valve
D. Contraction of the atria

72. The function of Carotid body is_______________?
A. Measures the change in Po2 in arterial blood
B. Measures Po2 in venous blood
C. Measures the changed in CO2 in arterial blood
D. Measures the change in CO2 in venous blood

73. What is common between systemic and pulmonary circulation is_____________?
A. Volume of the circulation per minute
B. Peripheral vascular resistance
C. Pulse Pressure
D. Total Capacity

74. The velocity of conduction in the Purkinjean fibers of the heart is__________________?
A. 1 to 4 m/sec
B. 5 to 8 m/sec
C. 9 to 12 m/sec
D. More than 12 m/sec

75. Which of the following increases turbulence in blood flow ?
A. Reynolds number < 2000
B. Decrease in velocity of blood
C. Decrease in density of blood
D. Increase in diameter of blood vessel

76. Glomerular capillary pressure differ from other capillaries of body in______________?
A. Higher filtration pressure
B. Lower filtration pressure
C. Both of the above
D. None

77. In determining blood pressure by auscultatory method_____________?
A. The loudest sound is the diastolic pressure
B. Systolic pressure estimation tends to be lower than those make by palpatory method
C. The first sound heard is the systolic pressure
D. The sounds that are heard are generated in heart

78. 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

79. Cardiac cycle duration in man is_______________?
A. 0.4 seconds
B. 0.8 seconds
C. 1.2 seconds
D. 1.6 seconds

80. Coronary blood flow is usually predominantly controlled by_____________?
A. Auto regulation
B. Hormones
C. Parasympathetic impulses
D. Sympathetic impulse