Homeostasis

It is vital that the liquid bathing body cells is of constant composition.

Homeostasis is the process that keeps internal body conditions within narrow limits.

Substances kept within narrow limits include carbon dioxide, water, glucose and salts.

The concentration of carbon dioxide is controlled by the hypothalamus.

The concentration of glucose in the blood is controlled by the hormones insulin and glucagon.

These hormones are produced by the pancreas and are active in the liver and muscle.

Homeostasis mechanisms are controlled by feedback mechanisms.

The process of osmoregulation controls the water content of the blood.

Water content is controlled by ADH, a hormone produced by the pituitary gland.

ADH is secreted in varying amounts and controls water reabsorption by the kidneys.