BIOL 0130 Lecture Notes - Lecture 5: Blood Sugar, Thyroid Hormones, Hyperthyroidism

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Main function: communicate system that helps body react to internal and external environment changes, release chemical messengers to signal other cells. The endocrine system consists of: glands and hormones. Organ that produces secretion for use in other parts of the body. Exocrine glands: ducts that secrete substances directly into body cavities, secretes into local cavities not in the bloodstream, uses ducts, e. g. gallbladder, tear ducts, salivary glands. Endocrine glands: lack ducts and secrete substances directly into the bloodstream, no ducts, e. g. pituitary gland, gonads. Chemical signal released in one part of the body, travels through the bloodstream and affects target cells in the other parts of the body. Tropic hormones: hormones that target endocrine glands (the hormone coming from the hypothalamus) Non-tropic hormones: directly stimulates target cells (hormone coming from the pituitary) Light + melatonin= seasonal affective disorders. Oxytocin and adh- see pituitary gland notes (nt) Function: regulates and coordinates between nervous and endocrine systems.

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