BSC 251 Lecture Notes - Lecture 6: Alpha Cell, Follicle-Stimulating Hormone, Aldosterone

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Read 17. 1, 17. 2, 17. 3, 17. 4, 18. 1, 18. 2, 18. 3, 18. 4, 18. 5, 18. 6, 18. 10. Intercellular communication: autocrine communication (cell talking to itself) See this with immune cells: paracrine communication. Chemical messengers: paracrine factors that bind to neighboring cells within the tissue. Localized effect; see this with inflammation: endocrine communication. Released into the bloodstream by chemical messengers called hormones until they reach the target tissues (that tissue or cell has the appropriate receptor) Occurs between neuron and another type of cell. Endocrine: communication system: includes endocrine cells and tissues, release secretions into ecf, then enter the bloodstream. Amino acid derivatives: hormones actually manufactured from an amino acid, includes those derived from tyrosine and tryptophan. Peptide hormones: larger than amino acid derivatives, not going to pass through the bilayer easily so they"ll act at the membrane, small and long. Hormones that bind to intracellular receptors: usually act as transcription factors (usually proteins that regulate the level of gene expression)

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