A nurse is educating a group of students about the structure and function of the cardiovascular system and its components. The nurse is educating the nursing students about the layers within arteries and veins of the heart
What does the nurse tell the students is the function of the tunica media layer? A) This layer is composed of connective tissues and nerve cells, as well as nutrient capillaries in larger vessels.
B) This layer contains the thickest elastic fibers, as well as connective tissue composed of polysaccharides.
C) This layer protects the outside of the vessel.
D) This layer is the thinnest—a single layer of simple squamous endothelium held together by an intercellular matrix.
B
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The layers within arteries and veins are as follows: tunica adventitia—the outermost layer. This layer is composed of connective tissues and nerve cells, as well as nutrient capillaries in larger vessels. This layer protects the outside of the vessel. Tunica media—the middle layer. This layer contains the thickest elastic fibers, as well as connective tissue composed of polysaccharides. This layer is covered by a thick elastic band and smooth muscle fibers, which control the caliber of the vessel. Tunica intima—the innermost layer. This layer is the thinnest—a single layer of simple squamous endothelium, held together by an intercellular matrix. This layer is surrounded by connective tissue interlaced with elastic bands (internal elastic lamina).
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