Vasoconstriction (from "vaso-" meaning vessel) is constriction of the blood vessels. The opposite of vasoconstriction is vasodilatation, which is the relaxation of blood vessels. Vasoconstriction causes the radius of blood vessels to decrease, while vasodilatation increases radius.
Blood flow through a vessel can be modeled as the flow of fluid through a pipe. Fluid flow through a pipe is directly proportional to the fourth power of pipe radius. As radius decreases, blood flow decreases, and vice versa. So vasoconstriction and vasodilatation can be used to regulate flow through a blood vessel.
Peripheral blood vessels are usually considered those not in the core of the body and not those that supply skeletal muscles. A common example is the blood vessels of the skin. So peripheral vasoconstriction and vasodilatation control the amount of blood flow to the skin.
Skin blood flow is a critical component of temperature regulation. To dissipate heat, warmblooded animals direct blood flow to the skin so it can be transferred to the surrounding environment. So if you were to exercise (which produces heat) or enter a steamy sauna, your skin blood vessels would vasodilate to direct that warm blood towards the skin surface so heat can be dissipated. Conversely, if you were to get cold for any reason, peripheral vasoconstriction would occur which would shunt blood away from the skin to help conserve heat and prevent its dissipation to the environment.
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It keeps the core warm by taking the blood from the outer extremities.
the temperature is elavated by 67%
Vasoconstriction helps limit blood loss from a ruptured blood vessel, buying precious time for platelets and coagulation to form. Vasoconstriction is instantaneous but short-lived and platelets and coagulation are needed for a lasting effect.
Vasoconstriction and Vasodilation are a part of a body negative feedback, in which the body tries to restore homeostasis. Homeostatis is the function of keeping the internal body at it's general temperature (37 degrees Celsius). Without the negative feedback of Vasoconstriction and Vasodilation, the body would either be at a very low or very high temperature and this high/low temperature could cause death.
cold weather causes vasoconstriction. Vasoconstriction restricts blood flow near the skin, so less heat is lost through the skin.
by vasoconstriction and opening of the airway
lowers the temperature lowers the temperature
Shivering produces heat and vasoconstriction reduces the ability of blood to dump its heat load to the skin's surface where cooling occurs.
Shivering produces heat and vasoconstriction reduces the ability of blood to dump its heat load to the skin's surface where cooling occurs.
Shivering produces heat and vasoconstriction reduces the ability of blood to dump its heat load to the skin's surface where cooling occurs.
Yes
lower temperature
sweat lowers the temperature of the body by getting rid of excess liquid