Which of the following is a type of chemical energy needed for sustained or repeated muscular contractions?

What refers to a definite course of action meant to guide and determine present and future decisions?

A) Directive B) Standing Order C) Procedure D) Policy

Which component of blood passes through blood vessel walls into surrounding tissues to defend the body against invading foreign antigens?

a. Red blood cells b. Platelets c. Leukocytes d. Gamma globulin