SCIENCE
CIRCULATORY SYSTEM
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Lumen
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AV node
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SA node
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Purkinje fibers
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Detailed explanation-1: -The arteriolar lumen regulates the flow of blood through the capillaries. Venules are the smallest veins and receive blood from capillaries. They also play a role in the exchange of oxygen and nutrients for water products. There are post-capillary sphincters located between the capillaries and venules.
Detailed explanation-2: -The walls of most blood vessels have three distinct layers: the tunica externa, the tunica media, and the tunica intima. These layers surround the lumen, the hollow interior through which blood flows.
Detailed explanation-3: -The word lumen is used to describe an internal space within an organ. As it applies to blood vessels, the lumen is the space inside a blood vessel where blood flows through the vessel.
Detailed explanation-4: -The endothelium is a single layer of squamous endothelial cells that line the interior surface of blood vessels and lymphatic vessels. The endothelium forms an interface between circulating blood or lymph in the lumen and the rest of the vessel wall.