PLN 203 Lecture 1: Chapter 18 – Endocrine System
16 Feb 2017
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It uses chemical messengers to relay information and instructions between cells. Parathyroid hormone: calcium hormone levels release for pth gland and acts on the kidneys (part of the regulatory control). Exchange of ions and molecules between adjacent cells across gap junctions. Occurs between two cells of same type. Uses chemical signals to transfer information from cell to cell within single tissue. Paracrine: say youre in a section in the pancreas you can send a message from cell to cell to cell through this type of communication (like sending a note to each cell of the organ) Endocrine cells release chemicals (hormones) into bloodstream. Alters metabloic activites of many tissues and organs simultaneously. Lots of hormones in the bond can be released by neurons into the blood or to other neurons (neuroendocrine communication) Are specific cells that posses receptors needed to bind and read hormonal messgaes. Stimulate synthesis of enzymes or structural proteins. Turn exisiting enzy(cid:373)eor (cid:373)e(cid:373)(cid:271)ra(cid:374)e (cid:272)ha(cid:374)(cid:374)les (cid:862)o(cid:374)(cid:863) or (cid:862)off(cid:863)
