Each of the blood vessel layers is affected differently by the aging process. Which would a nurse suspect is responsible for a patient's fibrosis?
A) Tunica intima
B) Tunica media
C) Tunica adventitia
D) Fibrosis is caused by an enlarged heart
A
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The tunica intima, the innermost layer, experiences the most direct changes, including fibrosis, calcium and lipid accumulation, and cellular proliferation. The middle layer, the tunica media, undergoes a thinning and calcification of elastin fibers and an increase in collagen, which causes a stiffening of the vessels. The outermost layer, the tunica adventitia, is not affected by the aging process. In the absence of heart disease, heart size changes little with age.
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