A muscle that contracts to assist the main muscle in performing a particular action is called a(n)

A) prime mover.
B) fixator.
C) antagonist.
D) agonist.
E) synergist.

Platelets are formed by:

A) cell division in the spleen.
B) disruption of a phagocyte.
C) fragmentation of the cytoplasm of a B lymphocyte.
D) small pieces pinching from very large cells in the bone marrow.
E) the release of granules from a neutrophil.