Psychology 3226A/B Study Guide - Zona Glomerulosa, Distal Convoluted Tubule, Nephron

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Homeostasis (eating and drinking behaviour: homeostasis, which is a term first coined by walter b. cannon in 1929, is the process by which organisms maintain a relatively constant internal environment/optimal level. Across time, the physiological parameter (i. e. water, temperature, na chloride, etc. ) will vary, but will always be brought back to a set point by the body"s internal regulators and/or behaviours that are often hormonally regulated. In order for these homeostatic regulators to work, they must be able to detect upper and lower variation from a set point, not just one or the other (real-life example is a hvac temperature system). As was the case with reproductive hormones being co-opted to facilitate/regulate mating behaviour, so hormones involved in physiological homeostasis are co-opted to facilitate homeostatic behaviours. On the contrary, cold- blooded/ectothermic animals must manipulate their environment to control body temperature. However, the set point can be changed according to environmental conditions.

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