the complex set of interactions among the hypothalamus, the pituitary gland, and the adrenal glands that regulate various body processes and control reactions to stressful events.

Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. once a virus gains entry into the body, it invades a host cell in order to? a. synthesize antibodies for defense b. deactivate the host cell's defenses c. access cell processes for reproduction d. metabolize host proteins and grow