2nd heart sound is characterized by all except______________?
(A) Due to closure of semilunar valves
(B) Is occasionally split
(C) Has longer duration than 1st heart sound
(D) Marks the onset of diastole
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
Cardiac output is a measure of______________?
(A) Peripheral resistance X tissue fluid
(B) Peripheral resistance X cardiac rate
(C) Blood pressure X cardiac rate
(D) Heart rate X blood volume
The largest function of the total peripheral resistance is due to _________________?
(A) Venules
(B) Arterioles
(C) Capillaries
(D) Precapillary sphincters
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
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
Closure of aortic valve occurs before the following event_______________?
(A) Isovolumetric contraction
(B) Isovolumetric relaxation
(C) Pre-diastole
(D) Pre-systole
Fastest conducting tissue in human heart _________________?
(A) AV node
(B) SA node
(C) Bundle of His
(D) Purkinje fibers