In response to hemorrhage, there is

The pulmonary arteries carry blood to the

An increased firing of the parasympathetic nervous system causes increased cardiac output.

Figure 20-2 Cardiac Cycle Use Figure 20-2 to answer the following questions: What occurs at the area labeled “B” on the graph?

The mitral valve is normally closed:

The _____ _____ normally establish the rate of contraction

Generalized vasoconstriction occurs as a result of:

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