BZT485: Application of Health Physics ocn Kingston College LONDON Vasodilation V

Question

BZT485: Application of Health Physics ocn Kingston College LONDON Vasodilation VASODILATION If body temperature rises this triggers... Rate of heat loss from body increases If the core temperature of the body starts to then the smooth muscle in 114 the arteriole walls arteriole dilates (gets wider) and the More blood flows through capillaries close to surface of the skin Smooth muscle in wall of arteriole relaxes and e dilates blood then flows through the capillaries near the surface of the skin. Less blood flows through This the rate of heat loss from the body. Vasoconstriction If body temperature falls this triggers... VASOCONSTRICTION Rate of heat loss from body DECREASES If the core temperature of the body then the smooth starts to muscles in the arteriole walls which constricts the arteriole Smooth muscle in wall of arteriole contracts which constricts the lumen Less blood flows close to surface of skin blood flows through the capillaries close to the surface of the skin as blood is redirected through the which are More blood is shunted away from surface of skin found in thela skin. elayers of the . This the rate of heat loss from the body

Explanation / Answer

Vasodilation:

If the core temperature of the body starts to rise, then the smooth muscle in the arteriol walls relax and the arteriol dilates.

More blood then flows through the capillaries near the surface of the skin.

This increases the rate of heat loss from the body.

Vasocontriction:

If the core temperature of the body starts to fall, then the smooth muscle in the arteriol contract which constrics the arteriol.

Less blood flows through the capillaries close to the surface of the skin as blood is redirected through the shunt vessel which are found in the inner layers of the skin.

This decreases the rate of heat loss from the body.

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