Identify the indicated structure (dark black circle)  

The layer of the heart wall synonymous with the visceral layer of the serous pericardium is:

Blood flow to a tissue will increase if the

Stroke volume depends on

Which one of the following is caused by a decrease in venous return to the heart:

The layer of the arteriole wall that can produce vasoconstriction is the tunica

Which type of pressure is the highest?

Cardiac output is calculated by multiplying the stroke volume by the systolic blood pressure.

The heart wall is composed of _____ layers of tissue

In Texas, primary elections are usually held in