PSIO 202 Lecture Notes - Lecture 3: Angiotensin, Interleukin 2, Paracrine Signalling

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Note: the endocrine system is a very diffuse system: any tissue/organ containing endocrine cells is part of the endocrine system. Question: blood vessels are controlled by the sympathetic division of the. Ns as well as by hormone such as angiotensin ii. Note: the way in which each hormone is secreted (local auto- and paracrine secretion vs. circulating endocrine secretion) is consistent with its intended function. Please note: the endocrine system does not included any exocrine glands. Importance: some organs have both exocrine and endocrine potions. Only the endocrine portion of an organ functions as part of the endocrine system. Note: local hormones can act as autocrine and paracrine signals at the same time. (e. g. il-2) Critical concept: all hormones have 1 or more types of target cells. To be a target cell for a hormone, all a cell must do is have a receptor for that hormone. Note: the response by target cells to steroid hormones is relatively slow.

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