Blood and the Cardiovascular System Exam t/f

Vasodilation increases the diameter of blood vessels.

True

When the ventricles contract, the semilunar valves are open.

True

The normal pH of blood is 6.35 and 6.45.

False

White blood cells engulf and digest bacteria in the process called pinocytosis.

False

Deoxygenated blood first enters the heart at the left atrium.

False

A hematocrit is the proportion of the total blood volume that is composed of red blood cells.

True

Eosinophils destroy parasitic worms.

True

In a blood sample, red blood cells are more abundant than white blood cells.

True

In diapedesis, white blood cells slip through spaces in the capillary walls.

True