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			"text":"Hypothalamus in the brain => monitors and regulates body temperature.\n=> receives info about temp. changes from 2 sources => thermoreceptors in the skin which detect temp from env and thermoreceptors in hypothalamus which detect temp of the blood. ",
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			"text":"**What Happens when Body Temperature Begins to Rise**\n=> warm day: rate of heat loss from the body decreases.\nWhen we perform vigorous muscle activities => large amount of heat released internally accumulates in the body\n\n=> causes rise in blood temperature.\n=> hypothalamus detects this rise. \n=> sends out nerve impulses to relevant parts of the body to bring about certain changes within the body.\n=> changes will cause decrease in body temperature. \n\nBody also absorbs heat when the surrounding temperature is higher than body temperature.\n=> warm day: thermoreceptors in skin detects the rise in the external temperature and immediately sends nerve impulses to the hypothalamus. \n=> the absorbed heat is mainly lost by evaporation of sweat from the body.\n\nThus, temperature of body is kept constant. \nExtra heat released during vigorous muscle activity or extra heat absorbed when in warm env is removed so that body temperature is maintained within a normal range.\n\n",
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			"text":"Normal Body temperature",
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			"text":"Body Temperature Decreases.\n- Hypothalamus detects this change due to thermoreceptors in hypothalamus (which detect body blood temp. )\n- Hypothalamus sends nerve impulses to relevant body parts ts to reduce the opposite effects. ",
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			"text":"**What Happens when Body Temperature Begins to Fall**\ncold day => rate of heat loss from body increases => esp. at skin surface.\n=> drop in temperature: at skin surface => stimulates thermoreceptors in skin to rapidly send nerve impulses to hypothalamus.\n=> drop in temperature of blood > also detected by hypothalamus.\n=> both cases: hypothalamus will promptly send nerve impulses to relevant parts f the body -> bring about certain changes. \nChanges will cause increase in BT\n\n",
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			"text":"Normal body temperature",
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			"text":"Body Temperature falls below normal",
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			"text":"Thermoreceptors in skin and hypothalamus are stimulated -> send nerve impulses to relevant body parts",
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			"text":"2",
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			"text":"4",
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			"text":"* Arterioles in the skin constrict. (vasoconstriction) \n\t* Allows less blood to flow through blood capillaries in skin *per unit time*. \n\t* less heat taken to surface\n\t* Hence less heat is lost through skin\n* Sweat glands become less active and produce less sweat. As less water in the sweat evaporates from surface of skin, less heat is lost from the body\n* Metabolic rate is increased. Increases amount of heat released within the body\n* When above responses are not sufficient to prevent a drop in body temperature => shivering (reflex contraction of body muscles) occurs. \n\t* rapid contraction and relaxation of skeletal muscles increases amount of heat released. ",
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			"text":"in conditions of prolonged exposure to extremely cold temperatures => frostbite may occur.\n=> fingers may lose their sensation, ice crystals form around the cells, causing death and destruction of cells in the skin. ",
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			"text":"* Arterioles in the skin dilate (vasodilation)\n\t* allows more blood to flow through blood capillaries in the skin *per unit time*\n\t* more heat taken to surface\n\t* hence more heat will be lost through the skin\n* Sweat glands become more active and produce more sweat. \n\t* as more water in the sweat evaporates from surface of skin => more heat is lost from the body. \n\t* this is an efficient mean of losing heat\n* Metabolic rate is decreased\n\t* reduces the amount of heat released within the body\n",
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			"text":"Body temperature rises above normal",
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			"text":"Thermoreceptors in the skin and the hypothalamus are stimulated. \nHypothalamus -> send nerve impulses to relevant body parts",
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			"text":"5",
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			"text":"Body temperature increases\n* Hypothalamus detects this change (due to thermoreceptors in the hypothalamus which detect body blood temp.)\n* Sends nerve impulses to relevant body parts to reduce the opposite effects. ",
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			"text":"mention above feedback here else i am sure they will mark you down",
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