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Because it is an involuntaru muscle contraction

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Smooth inner layer than surrounds the lumen of a blood vessel?

endothelium


What are the three layers of an artery and state their function?

The three layers of an artery are Endothelium, smooth muscle, and connective tissue.


Does endothelium provide a slick surface lining on all hollow cardiovascular organs?

Yes, endothelium does provide a smooth lining on all hollow organs within the cardiovascular system, such as blood vessels, heart chambers, and lymphatic vessels. This lining helps facilitate smooth blood flow and prevents excessive clotting or adhesion of blood cells.


What is the medical term meaning pertaining to the lining of an artery?

the endothelium is the inner most linning of the artery vessel. Or better known as the Intima..... The tunica intima, the innermost layer, consists of an inner surface of smooth endothelium covered by a surface of elastic tissues


Which layer of the heart wall is made up of endothelium overlying connective tissue?

The endocardium is the layer of the heart wall that is made up of endothelium overlying connective tissue. This layer lines the interior of the heart chambers and valves, providing a smooth surface for blood flow.


What epithelium is found in blood vessels?

Simple squamous epithelium


What layer consist of endothelium?

Capillary walls consists of a single layer of flat endothelium


How come smooth muscle fibers of an artery do not get nutrients from lumen?

The Vasa Vasorum supply the wall of the large arteries This method to feed the smooth muscle is necessary as the endothelium covering the lumen doesn't permit the ready diffusion of nutrients from the lumen.


Is the endocardium made up of simple squamous or stratified squamous epithelium?

Simple squamous. Just like the endothelium & mesothelium.


What lines the sinuses?

Endothelium


What is a single thin layer of endothelium called?

A single thin layer of endothelium is called a monolayer.


What has the author Gabor M Rubanyi written?

Gabor M. Rubanyi has written: 'The endothelium in clinical practice' -- subject(s): Pathophysiology, Physiopathology, Prostacyclin, Endothelium, Endothelins, Therapy, Thromboxanes, Vascular endothelium, Physiology, Heart Diseases