pollev cardiovascular system questions Flashcards
muscle relaxation will occur when
ATP displaces ADP from the myosin head
The Ca2+ influx to balance the K+ efflux is responsible for
refractory period of the action potential
_____ receives oxygenated blood from the pulmonary brains
left atrium
The rapid depolarization of the pacemaker cells is due to ____
Ca2+ channels (voltage-gated calcium channels)
Decreased blood being brought back to the myocardium is a direct consequence of a ____
heart attack
blood vessels are blocked
Abnormal T waves in the EKG can be most likely indicative of defects in ____
ventricular diastole
Abnormal QRS complexes in the EKG can be most likely indicative of defects in ____
ventricular systole
The slope constructed during the end-systolic volume in the PV loop indicates _____
contractility
The cardiac output is inversely associated with ____
end-systolic volume
The autonomic nervous system can _____ heart rate by causing ____ of the membrane potential of pacemaker cells.
increase, decreased repolarization
what permits the maximum exchange of substances by slowing blood flow to the greatest extent
arterioles
In the pressure-volume loop, a decrease in the end-diastolic volume is most directly indicative of a decrease in ____
preeeeeeeload.
physiologically the cardiac muscle is present in the ____ of the force-length relationship
ascending limp
(bicep curl up cuzz)
the threshold for rapid depolarization in autorhythmic cardiac cells is reached by the activity of _____
HCN channels!!!
hyperpolarization cyclic nucleotide-gated (HCN) Na+ channels
During isovolumetric relaxation there is no change in volume because the ventricular pressure is ___ than aortic pressure but ____ than atrial pressure
lower; higher
