lecture 2 homeostasis

lecture 2 homeostasis - Homeostasis: Definition: the...

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Homeostasis: Definition: the steady-state environment of the body. In particular, we are interested in how this steady-state is maintained. If the internal environment changes too much, it can be fatal. Example - you're thirsty. Why? Some receptor somewhere senses your need for water. Why? Because your body needs water to maintain a steady salt balance. Example - you're hot. Response? Take off excess clothes, sweat, fan yourself, etc. Why? Because an increase in body temperature can be dangerous. Obviously, there are many other examples. Most of what we’ll do here is to look at temperature regulation. Other examples are interspersed throughout the rest of the “organ systems” we'll be looking at. Temperature regulation: Heat can be exchanged by [Fig. 25.2, p. 506] - conduction. Heat is conducted from one structure to another. Example: getting into a hot bathtub. Heat goes from water to you. Similarly, picking up heat from surrounding structures such as a hot rock. - convection.
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lecture 2 homeostasis - Homeostasis: Definition: the...

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