Hormone regulation

Hormones are regulated by other hormones, glands and organs, and by a negative feedback mechanism.

• Tropic hormones regulate the release of other hormones. The anterior pituitary in the brain, the hypothalamus, and the thyroid gland secrete tropic hormones.
• Organs and glands help hormonal regulation by monitoring blood content. E.g. the pancreas will secrete the hormone glucagon if glucose levels are too low and insulin if glucose levels are too high.
• In negative feedback regulation, the initial stimulus is reduced by the response it provokes. E.g. the regulation of red blood cell production.