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Short answer:
Baroreceptors. These are located in the blood vessel's and sense / detect the pressure of blood flowing through them. These sensors can then send a message to the central nervous system to increase (vasoconstrict) or decrease (Vasodilate) the vascular resistance, thus raising or lowering blood pressure and cardiac out put.
There are also several medications used that have a similar effect, like Nitroglycerin (dilates) and dopamine (constricts)
Long answer:
Google or Wikipedia it. Or attain a book on anatomy etc...
What else can I help you with?
Which blood vessel tunic is composed of smooth muscle and controls the diameter of the vessel?
Tunica interna
When happens when the diameter of the blood vessel decreases?
Blood pressure increases if the diameter of the blood vessel decreases.
How does smooth muscle make blood vessels function?
Smooth muscle is mostly in the afferent branch going from the arteries to the arterioles. The body controls where blood will flow by controlling the vessel diameter. An increase in sympathetic tone constricts smooth muscle, decreases blood vessel diameter, and limits blood flow.
What is the role of smooth muscle in blood vessels walls?
The smooth muscle, which is innervated by the sympathetic nervous system, controls the diameter of the blood vessel, and it plays an important role in blood pressure.
What effect does local heat application have on blood vessel diameter?
Vasodilation or enlargement of the blood vessel
What is Vasolidation?
increase in the diameter of blood vessel. it increases the blood flow
A decrease in the diameter of a blood vessel is termed?
vasoconstriction.
Why is the medulla important to the body?
The medulla is so important to the body because it controls vital autonomic functions, actions that we can't control. It controls functions such as breathing, heart rate, blood vessel diameter, etc.
Would doubling the length of a blood vessel have the greater effect on vascular resistance?
In which of the following would the blood flow be highest? A) a vessel 0.5 cm in diameter and 4 meters long B) a vessel 1.0 cm in diameter and 10 meters long C) a vessel 0.5 cm in diameter and 2 meters long D) a vessel 1.0 cm in diameter and 2 meters long
What is the increase of diameter in a blood vessel called?
Vasodilation: Widening of blood vessels resulting from relaxation of the muscular wall of the vessels. What widens is actually the diameter of the interior (the lumen) of the vessel. The opposite of vasoconstriction.
Which of the following is NOT an important source of resistance to blood flow?
An important source of resistance to blood flow is not low blood viscosity, as low viscosity would actually decrease resistance. The important sources of resistance to blood flow are vessel diameter, vessel length, and blood viscosity.
What is the approximate diameter of a blood vessel?
In different parts of the body the blood vessels are of different diameters. The normal diameter of the aorta is around 2 cm and this would be the largest vessel in the human body, while the smallest, a capillary would be between 0.5 to 2.28 mm in diameter.
