02-24-2006, 05:30 AM
A 56 year- old man with extensive coronary atherosclerotic disease has evidence of coronary vasocontriction and myocardial ischemia. The most likely cause of the vasocontriction is failure of the endothelial cell layer, of the diseased coronary arteries to produce a substance with which of the following actions?
a) Activation of Na channels
b) Closure of K channels
c) Opening L-type Ca channels
d) Stimulation of ATP accumulation
e) Stimulation of cyclic GMP accumulation
a) Activation of Na channels
b) Closure of K channels
c) Opening L-type Ca channels
d) Stimulation of ATP accumulation
e) Stimulation of cyclic GMP accumulation