Exam 17: Cardiac Function

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

Myocardial cells are connected by gap junctions enabling them to

Electrical currents that travel through the heart are called vectors because they include (Select all that apply.)

Which is true about the mitral valve?

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

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

A vessel that normally contains desaturated (venous)blood is the

The v wave of an atrial pressure tracing corresponds to

The major factors that influence stroke volume are (Select all that apply.)

Echocardiograms are used to help diagnose (Select all that apply.)

In lead II of a normal electrocardiogram (ECG),the Q wave is a downward deflection resulting from ________ depolarization.

Which is true about blood flow from the atria?

Cardiac myosin has a high affinity for actin when the myosin has what molecule(s)bound to it?

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

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

Automatic pacemaker cells spontaneously depolarize,because

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

A standard ECG has 13 leads.

The major wave complexes of an ECG include the (Select all that apply.)

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