Edema occurs when

A) areolar tissue soaks up excess fluid in an inflamed area

B) reticular connective tissue invades the area

C) collagen fibers enlarge as they change from dehydrated to hydrated shape

D) adipose cells enlarge by pinocytosis

A) areolar tissue soaks up excess fluid in an inflamed area

Explanation:

Areolar tissue is found around blood vessels, muscles, nerve bundles. Edema which is also a part of inflammation occurs when blood capillaries of blood vessels leak the fluid and is soaked by areolar tissue. So excess fluid in these tissue cause swelling of that part.

Edema is one type of defense reaction to the cell injury. With fluid white blood cells and defense proteins move in the area and counter the infectious agent of injury and helps in eliminating the injurious factor. So the correct answer is A.