Define hormone. Explain the structure and functioning of pituitary gland. Support your answer with a suitable diagram.

Hormones are signaling molecules that are produced by specialized cells in the endocrine system and secreted into the bloodstream to travel to target organs and tissues. These chemical messengers play a vital role in regulating various physiological and metabolic processes in the body, including growth and development, metabolism, reproduction, and response to stress and injury.

Hormones are secreted by glands in the endocrine system, including the pituitary gland, thyroid gland, adrenal gland, pancreas, ovaries, and testes. Each hormone has a specific target cell or tissue, which has receptors that recognize and respond to the hormone. Hormones can also act on multiple target tissues throughout the body, and the same hormone can have different effects depending on the target cell and its receptor type.

Hormones can be classified into several categories based on their chemical structure and function. The most common categories of hormones include:

1. Peptide hormones: These hormones are composed of amino acids and include hormones such as insulin, growth hormone, and oxytocin.

2. Steroid hormones: These hormones are derived from cholesterol and include hormones such as testosterone, estrogen, and cortisol.

3. Amines: These hormones are derived from amino acids and include hormones such as adrenaline and dopamine.

4. Eicosanoids: These hormones are derived from fatty acids and include hormones such as prostaglandins and leukotrienes.

Hormones can have different modes of action depending on their chemical structure and function. Peptide hormones, for example, bind to receptors on the surface of target ______ ___ __________ ___ _________ __________ ______ ________ _______ ____ ___ _____.
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