Which process is a specialized function carried out by epithelial tissue?

Answer to q. 1

a

Answer to q. 2

Concepts to consider: LDLs enter the inner layer of arteries and are phagocytized by
macrophages which then become foam cells. The foam cells lead to the development of fatty
streaks in the arterial walls. Smooth muscle fibers and connective tissue fibers migrate to the
inner lining of the wall, along with white blood cells which produce substances that cause
chronic inflammation of the wall. The buildup of these various cells and substances form the
atherosclerotic plaque, which reduces the diameter of the artery and may eventually block it
completely. The plaque also causes the walls to lose their ability to stretch.
As a consequence, tissues downstream from the plaque receive less blood and consequently
less oxygen and nutrients. This may cause angina pectoris (chest pains) or even a myocardial
infarction (heart attack). If a portion of the plaque breaks open, platelets may adhere and
produce a clot, or thrombus. In the heart this can lead to cardiac arrest. In the brain this can
lead to a stroke.

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