Vasodilation & Vasoconstruction Cards with brief descriptions of Vasodilation and Vasoconstriction. 3.0 / 5 based on 1 rating ? ScienceThe human bodyGCSEAll boards Created by: Hannah BartlettCreated on: 17-11-10 14:04 Vasodilation & Vasoconstriction Blood temp. monitored the hypothalamus in the brain. Hot conditions - blood vessels dilate, allowing more blood flow to the skin capillaries. Vasodilation - heat is lost from surface of skin by radiation. Cold conditions - blood vessels constrict, reducing blood that flows through skin capillaries. Vasoconstriction - Less heat lost from surface of skin by radiation. 1 of 3 Hypothermia Occurs when body is exposed to low temperatures for long periods of time. Body can't replace heat as fast as it's being lost. If untreated, can lead to death. Common cause, when core body temperature falls below 35 degrees celcius. Symptoms - grey skin colour, amnesia, shivering, slurred speech, confusion, loss of co-ordination, cold skin. Treatments - raising core body temperature, insulating body, drinking warm drinks. Should not rub/massage the skin because it brings blood to the surface, causes more heat to be lost. 2 of 3 Heat Stroke Heat Stroke - uncontrolled increase in body temperature. Increased sweating due to very hot temperatures leads to dehydration. Dehydration - stops sweating from occuring, leads to core body temperature increasing further. 3 of 3
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