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__________ handle tissue exchange.

Skeletal muscle is

Mitosis occurs during

The basic unit of biological organization is the ____.

Elderly individuals are more prone than younger individuals to have all of the following, except

_____ – at the start all heart valves are closed, then chamber decreases in size, push blood into ventricles finally both semilunar valves open and push blood out of the heart

Waves of muscular contractions that propel the contents of the digestive tract from one point to another are called

_____ – at the start all heart valves are closed, then chamber decreases in size, push blood into ventricles finally both semilunar valves open and push blood out of the heart

B cell activation would not occur without _____ from a(n) _____

Two hormones that have additive effects are called