Animal coordination, control and homeostasis

The endocrine system secretes hormones into the bloodstream from glands throughout the body. Hormones travel in the blood stream to specific target organs, where they have an effect.

Hormones regulate the menstrual cycle. This involves the monthly release of an egg from the ovary and the build-up and breakdown of the lining of the uterus.

Homeostasis is the regulation of internal conditions inside cells or organisms, to create the optimum conditions for cell function.

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