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

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.