0
How does vasoconstriction and vasodilation of blood vessels effect blood pressure?
Wiki User
∙ 9y ago
No. Vasoconstriction is a squeezing of the veins. This is like putting your thumb at the end of a garden hose. The constriction of the flow increases the pressure. The water shoots out faster from the hose when your thumb is blocking the way. If the entire hose were to tighten, as in vasoconstriction, the same effect happens.
--
From Wikipedia: Vasoconstriction
"Generalized vasoconstriction usually results in an increase in systemic blood pressure..."
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoReduced flow from smaller vessels created increased pressure, it's like putting your thumb over the end of a hose.
---
Imagine vasodilation of an artery. The blood that is being pumped by the heart at a certain pressure flows through. Now imagine vasoconstriction. The artery's lumen (the space allowed for blood to pass) essentially narrows. But, the same amount of blood must pass through as when vasodilation occurs. So what happens? The blood pressure is increased to allow a greater volume of blood through the constricted artery.
Wiki User
∙ 9y agoVasoconctriction of blood vessels lead to increase in blood pressure and vasodilation of blood vessels lead to decrease in blood pressure.
Wiki User
∙ 13y agono, vasoconstriction increases blood pressure
Wiki User
∙ 10y agoBlood pressure increases.
Wiki User
∙ 11y agoVasostriction increases blood pressure.
Add your answer:
Earn +20 pts
Effect of estrogen on blood vessels?
Estrogen has a vasodilation action on blood vessels.
What effect does vasodilation have on blood pressure?
Vasodilation causes a drop in blood pressure.
How does carbon dioxide affect cerebral artery?
CO2 causes vasodilation of the cerebral artery. The mechanism is pressumed to be due to direct effect of CO2 on the wall of the blood vessels. Anecdotal/clinical evidence: In emergency head injury, raised intracranial pressure can be treated by hyperventilating the patient. Hyperventilation reduces the PaCO2 in the blood. This causes vasoconstriction of the cerebral vessels and reduces ICP almost immediately.
What hormone causes vasodilation of the blood vessels?
Epinephrine can cause vasodilation provided the level is low enough. If beta-2 recptors are activated (without the level of epinephrine being high enough to involve the significant numbers of alpha receptors), then the effect of epinephrine on the vascular smooth muscle be relaxation, thus, dilation. However, higher levels of epinephrine will activate alpha receptors which will cause vasoconstriction.
Do cold temperatures have a vasoconstricting effect on blood vessels?
Yes. Increased body temperature that is associated with a cold can cause the vasodilation effect and heart rate increases
Does cold have a vasodilation effect?
No, it has a vasoconstricting effect.
How do vasodilation and vasoconstriction help to keep your body temperature constant?
Blood carries many things including heat, so where blood flows the heat from the body follows. Vasodilation and Vasoconstriction is the act of opening or closing the lumen of the blood vessels. Opening the vessels (vasodialtion) to the skin allows the heat to be carried to the surface of the body where it escapes into the atmosphere. This is why you go red at a medium level of exercise. The extra heat produced is corrected by increasing the blood flow to the skin allowing heat to dissapate and intensifying the rednes. In cold weather flow to the skin is decreased through vasoconstriction meaning that less heat is lost to the atmosphere.
What is effect of adrenallin in anaphylactic shock?
by vasoconstriction and opening of the airway
What is the effect of hypovolemic shock on the blood vessels and the heart?
Blood vessels constrict to increase venous return and maintain pressure. Heart rate increases to compensate for loss of blood pressure and to maintain cardiac output.
How does vasoconstriction effect your body temperature?
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.
What effect does local heat application have on blood vessel diameter?
Vasodilation or enlargement of the blood vessel
What is the Neural control of blood pressure and flow?
the parasympathetic nervous system has little effect because it calms the body but the sympathetic system causes vasoconstriction (when the blood vessels get narrow) and that narrowing increases the blood pressure. the pressoreceptors are activated and it sends off signals which makes the arteries of the neck and chest which brings BP back up to normal.
