Question

100 POINTS!!!!!

Answer 1

The walls of arteries and veins have three layers or tunics: An outer layer (tunica adventitia) of connective tissue with collagen fibers. An inner layer (tunica intima), consisting of a specialized simple squamous epithelium, often called the endothelium, that lines all blood vessels and the endocardium of the heart.

The blood pressure on veins is less than that in the arteries because they are draining blood from the capillary bed. As a consequence of lower pressure in veins, they contain internal flaps which act as one way valves to prevent blood from flowing in the wrong direction. Veins return blood to the heart.

Answer 2

Answer:

The wall of an artery consists of three layers. The innermost layer, the tunica intima (also called tunica interna), is simple squamous epithelium surrounded by a connective tissue basement membrane with elastic fibers. The middle layer, the tunica media, is primarily smooth muscle and is usually the thickest layer. It not only provides support for the vessel but also changes vessel diameter to regulate blood flow and blood pressure. The outermost layer, which attaches the vessel to the surrounding tissue, is the tunica externa or tunica adventitia. This layer is connective tissue with varying amounts of elastic and collagenous fibers. The connective tissue in this layer is quite dense where it is adjacent to the tunic media, but it changes to loose connective tissue near the periphery of the vessel.

heres the website :

https://training.seer.cancer.gov/anatomy/cardiovascular/blood/classification.html      

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