If one of the functions of the capillaries is to supply body cells with oxygen and nutrients, you would expect the capillary walls to consist of

A) connective tissue.
B) keratinized epithelium.
C) stratified squamous epithelium.
D) simple columnar epithelium.
E) simple squamous epithelium.

Capillary Walls

The thin, permeable barriers of capillaries through which exchange of gases, nutrients, and wastes occurs between blood and tissues.

Simple Squamous Epithelium

A solitary layer of flattened cells lining areas engaged in diffusion and filtration, including blood vessels and lung air sacs.

Keratinized Epithelium

A type of epithelial tissue that has become hardened or cornified through the incorporation of keratin, often found in the outer layers of the skin, hair, and nails.