An Introduction to Hormones

An Introduction to Hormones

Hormones regulate various biological activities including growth, development, reproduction, energy use and storage, and water and electrolyte balance. They are molecules that act as chemical messengers in the body’s endocrine system. Most hormones are carried by the circulatory system to different areas where they influence specific cells and organs

Hypotheses

Endocrine signaling: When a hormone binds to a receptor, it causes changes within the cell that influence cellular function.

Hormone Regulation

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

Peptide Hormones

These protein hormones are composed of amino acids and are unable to pass through a cell membrane.

Steroid Hormones

Steroid hormones are lipid-soluble and able to pass through the cell membrane to enter a cell.

Source

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