IHST 1002 Study Guide - Midterm Guide: Pineal Gland, Autocrine Signalling, Paracrine Signalling

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Module 1: the endocrine system part a: overview and part b: hormones. Electrochemical impulse -hormones travel in bloodstream; indirect message. Nervous system specific, rapid signalling, short duration. Endocrine travel in bloodstream, broad, slow signalling, long lasting. Have scattered endocrine cells, but not a lot of tissue. Endocrine: produce and release hormone directly into bloodstream. Exocrine: cells surround ducts, and those help to get to target. Autocrine signalling: sending signal back to same cell, where it came from. Paracrine signalling: release signal, and it goes to very local target cell. Induce secretory activity hormone tells cell to secrete. Communication within target cells a: water soluble hormones. Water soluble hormones bind to receptors in plasma membrane 2nd messenger inside cell mediates cell response. 5. camp activates protein kinase the cell finally gets what it wants. Pip2-ca2+ signalling mechanism - intracellular calcium acts as 2nd messenger. Communication within target cell b: lipid soluble hormones.

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