Small arteries that are dilated or constricted to control peripheral resistance, and thus blood pressure, are .
A) Blood flow into a capillary bed is regulated by the sphincter.
B) The , or inner-most layer of blood vessels, is made of endothelial tissue.
C) The pressure of nondiffusible molecules pulling water to them is called colloid .
D) Reduction in the diameter of a blood vessel is called , and typically results in an increase in blood pressure.

Small dilated or contracted arteries to control peripheral resistance and therefore blood pressure are the innermost layer of blood vessels that is made of endothelial tissue and is called arteriole. Arterioles consist of arterial branches with a diameter of less than 0.1mm, and the triple wall constitution observed in the elastic and muscular arteries is highly reduced in arterioles. These structures act by regulating, in particular, the resistance to blood flow and, consequently, the peripheral blood pressure.

Larus Larus · Answer 2 · 2022-02-22T12:03:02+01:00

The innermost layer of blood vessels, formed of endothelial tissue are the small arteries known as arterioles, which are constricted or dilated to monitor peripheral resistance, and thus blood pressure.

What are arterioles?

It is a type of small blood vessels, which branch from arteries. They are a component of microcirculation. They arise from arteries and further get branch into capillaries. The diameter of the arterioles is less in comparison to arteries, and the adjustment of diameter takes place to monitor the flow of blood.

The arterioles comprises arterial branches with a diameter of less than 0.1 micrometer, and the walls in arterioles are highly reduced in comparison to the arteries. The arterioles work by regulating, in specific, the resistance to the flow of blood, and consequently, the peripheral blood pressure.

Thus, the correct answer is option B.

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