BIOS1167 Final: BIOS1167 Study Notes
1 Sep 2018
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Homeostasis and control systems: understand the concepts of constant internal environment and homeostasis. Explain what is meant by the internal environment of an organism and explain the relationship between the internal environment and the extracellular fluid. A constant internal environment is maintained and stabilized by homeostasis. Intracellular fluid (inside the cell: extracellular fluid (outside the cell) Explain why it is necessary to control the internal conditions in our body. The body has strict requirements for proper functioning: core body temperature- ~37 degrees celsius, fluid balance (volume and concentration, blood pressure (within limits)~100mmhg mean arterial pressure, o2/ co2 levels (blood ph~7. 4) Important to ensure optimal conditions for enzymes- absolute requirement for normal body function. Homeostatic mechanism: property of a system that regulates its internal environment and tends to maintain a stable, constant condition. For example: the hypothalamus (which is a homeostatic mechanism) senses when your body"s temperature is too high or too low.
