An absolute refractory period occurs when a nerve fiber can be restimulated only by a much stronger stimulus than the initial stimulus

Tetanus can cause a massive skeletal muscle contraction that causes the entire body to arch, a condition called ____.

A. trismus B. spasm C. risus sardonicus D. opisthotonus

The ________, which begins the mechanical and chemical breakdown of food, is shown at letter E on the figure of the digestive system.

Fill in the blank(s) with the appropriate word(s).