Coronary vessels are open when the heart is

Occlusion of blood vessels tends to lead to

At the AV node of the conduction system, the action potential is

Purkinje fibers are small fibers within the atria that conduct impulses rapidly.

The reason it is more appropriate to call an erythrocyte a “formed element” rather than a “cell” is that erythrocytes

The most numerous of the formed elements are the

T-lymphocytes are a category of

Which are the least numerous of the leukocytes?

An autorhythmic heart cell is one in which

The main function of leukocytes is to