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Description
Flashcards by Elena Cade, updated more than 1 year ago
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Created by Elena Cade
almost 9 years ago
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| Question | Answer |
| Homeostasis definition: | The maintenance of a constant internal environment in organisms |
| Negative feedback mechanism definition: | A change from the normal level is detected and triggers a response which reverses the change and restores the norm |
| Stimulus: | A change in the environment |
| Receptor: | Detects any deviation from a set point |
| Coordinator | Coordinates information from receptors |
| Effector | Brings about changes to return a system to a set point |
| Response | a change brought about by an effector |
| Ectotherm: | Animals such as reptiles which gain their body heat from the environment |
| Endotherm: | Animals, such as birds and mammals which generate most of their heat from respiration |
| Regulation of body temperature of ectotherms: | Exposure to sun, sheltering in the shade, gaining warmth from the ground, generating metabolic heat from respiration showing colour variations |
| Metabolic activities when the blood temperature of endotherms fall below normal: | Vasoconstriction Hair erector muscles contract Shivering - skeletal muscles Brown/White fat Hormone - adrenaline Behavioural mechanisms e.g putting on clothes etc. |
| Metabolic activities if the blood temperature in endotherms reaches above normal: | Vasodilation Hair erector muscles dilate Sweating Behavioural mechanisms e.g sitting in the shade |
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