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Mature ________ are the most abundant of the formed elements.

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

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

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

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

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

A nutrient that the body cannot synthesize, but instead must get from a balanced diet, is said to be ____________.

The healthy level for hematocrit in females is _____.