It is essential that the physical and chemical processes of the body are controlled. Homeostasis is the maintenance of a stable internal environment by the regulation of these processes within acceptable limits. Organisms receive oxygen, food, water, salts and warmth from the environment and return carbon dioxide and other wastes to it. Due to homeostasis, mammals and birds have a measure of independence from the external environment, whilst still existing in equilibrium with it.
Regulation of blood concentration
The insulin-glucagon control mechanism is illustrated in Fig 2.
Increasing oestrogen and progesterone concentrations inhibit any further release of LH by negative feedback.
Regulation of the birth process
back into a lower level by negative feedback, since the mechanical stimulation of the uterine wall is no longer present.
Regulation of body temperature