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.Management Sciences
Category: Cardiovascular system
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
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
Starling’s law of the heard________________?
A. Does not operate in the failing heart
B. Does not operate during exercise
C. Explains the increase in cardiac output that occurs when venous return is increased
D. Explains the increase in cardiac output when the sympathetic nerves supplying the heart stimulated
SA node acts as a pacemaker of the heart because of the fact that it_________________?
A. is capable of generating impulses
B. Has rich sympathetic innervation
C. Has poor cholinergic innervation
D. Generates impulses at the highest rate
Closure of aortic valve occurs before the following event_______________?
A. Isovolumetric contraction
B. Isovolumetric relaxation
C. Pre-diastole
D. Pre-systole
The following factors increase the cardiac output except______________?
A. Preload
B. After load
C. Heart rate
D. Myocardial contractility
Heart muscle, true are all except_______________?
A. Act as syncytium
B. Has multiple nuclei
C. Has gap junctions
D. Has branching
The largest function of the total peripheral resistance is due to _________________?
A. Venules
B. Arterioles
C. Capillaries
D. Precapillary sphincters
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