13. What term do we use to describe the maintenance of constant conditions, such as blood glucose levels, body temperature and water levels, inside the body?
A. Hormonal control
B. Nervous system
C. Homeostasis
D. Endocrinosis

C. Homeostasis

Explanation:

"Homeostasis" refers to the process of maintaining the body's equilibrium. The body tries to adjust to different stimuli in order to help it function in normal ranges. For example, when a person is exposed to a cold weather all of a sudden, the person starts to shiver in order to maintain homeostasis. Shivering is a contraction of the muscles that allows the generation of heat.

On the contrary, when a person is exposed to the sun during summer, his body will start to sweat in order to maintain homeostasis. Sweating allows the heat to dissipate from the body thereby lowering the body's temperature.