LSB258 Lecture Notes - Lecture 2: Insulin, Estrogen, Thymosin

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The endocrine system ductless glands that release chemicals (hormones) into the blood to regulate body functions. A hormone is a chemical messenger that is transported via the bloodstream to act on distant target cells: hormones are specific and will only activate cells or tissues that possess the appropriate target receptor. The endocrine system is slower to initiate, but has a more prolonged response when compared to the nervous system. Tropic hormones are hormones that have other endocrine glands as their target. Endocrine glands secrete their product (hormones) directly into the bloodstream. Rather than through a duct (exocrine gland) Major endocrine glands include the pancreas, adrenal gland, thyroid gland, pineal gland, ovaries and testes. The hypothalamus and pituitary gland are neuroendocrine glands. Function to link the nervous and endocrine systems. Some organs may also secrete hormones despite not being endocrine glands (adipose tissue secretes leptin) Secondary endocrine organs hormone secretion is secondary to some other functions.

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