Thermoregulation

ameliavincent123
Flashcards by ameliavincent123, updated more than 1 year ago
ameliavincent123
Created by ameliavincent123 over 5 years ago
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Regulation of temperature

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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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