Exam 17: Cardiac Function

Phase 0 of the cardiac muscle cell action potential is associated with ________ channels.

A requirement for rhythmicity is that the cell membrane has channels that automatically open during phase ________.

While caring for a geriatric patient, the changes in the heart that may be expected include

Which proteins are associated with the thin filament in the cardiac muscle?

During which phase of the cardiac cycle is the mitral valve normally open?

One role of ATP in cardiac muscle contraction is

Myocardial cells are connected by gap junctions enabling them to

An increase in intracellular calcium ion results in myocardial contraction, because calcium

At very high heart rates, cardiac output

Parasympathetic stimulation of the heart generally leads to a decrease in heart rate, because acetylcholine

Electrical currents that travel through the heart are called vectors because they include

Blood is transported from the right ventricle to the lungs by the

Which is true about blood flow from the atria?

Echocardiograms are used to help diagnose

Which is a true statement about the affect of the Frank-Starling law on the heart?

The R wave is responsible for ________ depolarization.

The major wave complexes of an ECG include the

Which physiologic change increases cardiac work but does not enhance cardiac output?

Automatic pacemaker cells spontaneously depolarize, because

Creatine phosphate is