Within plasma, the transport of nonprotein nitrogen substances is important for the ______.

The gastric enzyme ________ is secreted in inactive form and activated by the low pH of gastric juice.

The _______ pumps blood into the pulmonary trunk.

The _________ projects anteriorly to form Adam’s apple.

Mature ________ are the most abundant of the formed elements.

________ are the blood cells that help provide a defense against disease organisms.

The right atrium passes ________ blood through the ________ valve to the right ventricle.

What is the difference between a public and private instance variable?

The __________ receives input from higher brain centers and sends nerve impulse to the respiratory centers in the medulla oblongata to modify the breathing pattern.

Worn-out red blood cells are removed from circulation by the _________ and ___________.