The ________ covers the outer surface of the heart.

The amount of blood returning to the heart is the

Vickie has a tumor that secretes excess amounts of the hormone aldosterone. Because of the elevated level of hormone, she exhibits

Blood flowing into the heart from the venae cavae flows next through the ________ valve.

A faster-than-normal heart rate is called

________ form elaborate capillary networks within tissues that allow for very slow blood flow.

Which of these events is NOT associated with ventricular systole:

The muscular layer in the wall of a blood vessel is the tunica

Figure 20-2 Cardiac Cycle Use Figure 20-2 to answer the following questions: What occurs at the circled label “5” on the graph?

________ is when the heart can’t maintain adequate cardiac output.