Exam 20: Cardiovascular System: the Heart

Action potentials pass from one myocardial cell to another through areas of low electrical resistance called

During hemorrhagic shock in which blood pressure is decreased,which of the regulatory mechanisms is most important is increasing cardiac output to help maintain blood pressure?

The product of the stroke volume times the heart rate is known as the

Afterload is

If cardiac muscle cells are unable to repolarize,this would cause

The ion primarily responsible for depolarization in pacemaker cells is ______________,whereas the ion primarily responsible for this in other cardiac cells is _____________.

The volume of blood pumped during each cardiac cycle is the

When left atrial pressure exceeds left ventricular pressure,

All cardiac veins empty into the _________,which then empties into the _______.

A stab wound into the heart can result in cardiac tamponade.This means that

Regurgitation of blood flow through the aortic semilunar valve would give rise to

Baroreceptor reflexes

A patient has been diagnosed with mild heart disease.Tests show that some of the coronary arteries are partially occluded.Which of the following is the best course of action to treat the disease?

The valve located between the right ventricle and the pulmonary trunk is the

All of the following characteristics of the sarcoplasmic reticulum in cardiac muscle cells are true except ________________.

The cardiac electrical impulse normally begins spontaneously in the SA node because

Within normal limits,an increase in preload leads to

An incompetent mitral valve may cause blood to back up into the

Identify the structures that contribute to the slow onset of contraction and prolonged contraction phase in cardiac muscle tissue.