0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
If you feel dizzy and everything goes black?
What you were experiencing, in doctor speak, is orthostatic hypotension, a sudden drop in blood pressure. Normally, blood vessels constrict to maintain blood pressure and compensate for changes in position, but in some cases the blood vessels don't compensate and, when you stand up, the blood doesn't go to the brain. Basically, the reflexes of the body don't catch up with the blood vessels.
Does dehydration cause vasodilation?
I am not 100% sure if dehydration could cause vasodilation (swelling of a blood vessel), although it does make sense. As the temperature of the body rises, the blood vessels expand to release heat quicker. If one becomes dehydrated, and is then covered in ice packs, they may experience vasoconstriction, causing the blood vessels to constrict and hold heat in more, which would be unwanted.So if you were asking if dehydration causes dilation of the blood vessels, then yes.
Are most innervated blood vessels receive only sympathetic nerve fibers?
Most of the viscera get nerve supply from both sympathetic and parasympathetic systems.
What structure in the dermis help maintain the temperature?
Firstly, your sweat pores help maintain temperature by opening or closing. When your body temperature is too high, the sweat pores open and more sweat is released outside of your body, thus resulting in more evaporation of sweat and a faster cooling of your body. When your body temperature is too low, your sweat pores close and sweat production decreases to minimize heat loss. Secondly, your skin arterioles and shunt vessels help maintain your body temperature by dilation or constriction. When your body temperature is too high, your shunt vessels constrict and your skin arterioles dilate, thus causing less blood to flow into the shunt vessels and more blood to flow into the blood vessels nearer your skin and losing heat more efficiently. When your body temperature is too low, your shunt vessels dilate and your skin arterioles constrict thus causing more blood to flow into the shunt vessels and less blood to flow into the blood vessels nearer your skin and thus minimizing heat loss. Hope that helps!
What is vasco-constriction?
Vasoconstriction is the narrowing of the blood vessels resulting from contraction of the muscular wall of the vessels, particularly the large arteries and small arterioles. The process is the opposite of vasodilation, the widening of blood vessels. The process is particularly important in staunching hemorrhage and acute blood loss. When blood vessels constrict, the flow of blood is restricted or decreased, thus, retaining body heat or increasing vascular resistance. Cutaneously, this makes the skin turn paler because less blood reaches the surface, reducing the radiation of heat. On a larger level, vasoconstriction is one mechanism by which the body regulates and maintains mean arterial pressure.See the related link for further information.
Do blood vessels constrict when heat is applied to the skin?
Yes
Do blood vessels constrict or expand when a person overheats?
yes
What nervous system signals blood vessels to constrict?
The Sympathetic
Does blood vessels constrict in actively contracting muscles?
no
What is the effect of histamine on small as well as large blood vessels?
Histamine causes the dilation of the small blood vessels while constrict the large blood vessels.
Does Prostaglandins produced in the kidneys cause renal blood vessels to dilate?
yes
What make blood vessels constrict and dilate?
Nothing, blood vessels are nothing because they wont harm you or anything like that.
What happens when blood vessels constrict?
The temperature of the body decreasesThe blood pressure lowers with individual variations on the the systolic and diastolic measures. Also, the body temperature is modified. There is a difference between dilatation of large vessels like arteries and peripheral circulation which is constituted of small blood vessels or capillaries. (also in the brain)
How are blood pressure and barometric pressure associated?
blood vessels constrict according to barometric pressure
What chemical cause blood vessels to constrict?
Two examples are histamines and amphetamines.
What causes blood to be trapped in the penis?
With appropriate stimulation, the blood vessels that lead out of these compartments constrict, trapping blood.
What medication causes blood vessels to narrow?
epinepherine will constrict tiny blood vessels.
