A hormone receptor is a special protein found in or on the surface of cells that helps the body respond to hormones. Hormones are chemical messengers produced by glands like the thyroid or adrenal glands. When a hormone binds to its specific receptor, it triggers a series of actions within the cell, leading to various effects, such as growth, metabolism, or mood changes. These receptors are crucial for maintaining balance in the body, known as homeostasis. Different types of hormone receptors exist, such as insulin receptors for regulating blood sugar levels and estrogen receptors that influence reproductive functions. Understanding hormone receptors is essential for developing treatments for hormonal imbalances and related diseases.