3173242
Description
Flashcards by ameliavincent123, updated more than 1 year ago
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Created by ameliavincent123
over 8 years ago
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| Question | Answer |
| Temperature receptors | skin (external), hypothalamus (internal - blood flowing through the brain) |
| Control center | Thermoregulatory centre in the hypothalamus |
| Effectors of heat loss (8) | 1.Evaporation 2.Radiation 3.Convection 4.Conduction 5.Breathing rate 6.Excretion 7. Vasodilation 8.Metabolic rate |
| Effectors of heat conservation (5) | 1.Vasoconstriction 2.Sweat 3.Hairs 4.Muscles 5.Metabolic rate |
| What is our first response to temperature? | Voluntary (clothes or movement to areas) |
| Our second response is | Involuntary (control centre activated) |
| Adrenaline | Released near adrenal gland to increase metabolic rate and heat production |
| Thyroxine | released by thyroid gland (neck) in long term exposure to low temperatures causing sustained increased metabolism |
| Pituitary hormone releasing factors | Secreted which cause anterior lobe of pituitary gland to beginning secreting TSH (thyroid stimulating hormone) |
| What does TSH do? | Stimulates release of thyroxine in thyroid gland |
| Fever | chemicals called pyrogens released by white blood cells raise the set point of the thermoregulatory centre causing the whole body temperature to increase 2-3˚. This helps kill bacteria, inhibits viruses, and explains why you shiver even though you are hot. |
| Frostbite | usually your blood carries oxygen so that body tissues are kept healthy. As a protective response, in extreme cold, vasoconstriction occurs so blood is diverted away from your extremities towards vital organs. Lack of oxygenated blood cause damage to the skin cells. |
| Heat Stroke | -core body temperature of 41˚ -fainting, throbbing headache, dizziness, lack of sweating, red/hot/dry skin, muscle weakness, nausea and vomiting, rapid heartbeat, rapid and shallow breathing, behavioural changes, seizures, unconsciousness |
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