BIOL-K - Biology BIOL-K 103 Lecture Notes - Lecture 8: Thyroid, Kkcw, Inositol Trisphosphate
27 Apr 2016
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Endocrine glands: specialized to produce and secrete hormones, have no ducts, secrete their hormones into the surrounding interstitial fluid or blood. Exocrine glands release secretions into ducts, cavities. Hormones produced by endocrine glands and specialized cells in many tissues: primary endocrine organs. Ex: hypothalamus, pituitary, adrenals: secondary endocrine organs. Transmits electrical and chemical signals: effectors. Other neurons, muscle cells, gland cells, endocrine cells. Fatty acid derivatives: prostaglandins and juvenile hormones of insects, juvenile helps with development of insects chain of fatty acid, prostaglandin two chains of fatty acids. Steroid hormones: cortisol, testosterone, estrogens and progesterone; synthesized from cholesterol, molting hormone, cortisol, estradiol, come from cholesterol. Amino acid derivatives: hormones such as thyroid hormones (t3 and t4); synthesized from tyrosine and iodide. Peptide and protein hormones don"t have to be long chains: protein hormones (insulin) and neuropeptides (adh) Classical endocrine signaling: steroid and thyroid hormones. Bind intracellular receptors: water soluble peptide hormones.
