1Q: the intrinsic pacemaker rate of ventricular myocardial cells is:
a. more than 80 bpm
b. 60 t0 80 bpm
c. 40 to 60 bpm
d. fewer than 40 bpm
2Q: an example of a beta-blocker that is administered to decrease automaticity is:
a. Cardizem
b. Cordarone
c. Lopressor
d. Rythmol
3Q: so that the blood may flow from the right ventricle to the pulmonary artery, which of the following conditions is NOT required?
a. the atrioventricular valves must be closed
b. thge pulmonic valve must be open
c. right ventricular pressure must be less than pulmonary arterial pressure
d. right ventricular pressure must rise with systole
4Q: heart rate is stimulated by all of the following EXCEPT:
a. excess thyroid hormone
b. increased levels of circulating catecholamines
c. the sympathetic nervous system
d. the vagus nerve
5Q: stroke volume of the heart is determined by:
a. the degree of cardiac muscle strength (precontraction)
b. the intrinsic contractility of the cardiac muscle
c. the pressure gradient against which the muscle ejects blood during contraction
d. all of the above factrors
KINDLY PLACE ONLY THE LETTERS… please help me about this thing… PLEASE… and can you give me some links were can i find your answers for a review, THANKS… :]