PATHOLOGY

Detailed explanation-1: -Capillaries contain two layers of cells: Endothelial cells are inside the capillary. They control the flow of fluid, nutrients and gases. Epithelial cells form a protective layer around the endothelial cells.

Detailed explanation-2: -The capillary wall is a one-layer tissue so thin that gas and other items (eg oxygen, water, proteins and fats) can pass through them driven by pressure differences.

Detailed explanation-3: -Capillaries are very thin, approximately 5 micrometers in diameter and composed of only two layers of cells. The inner layer is made up of endothelial cells with an outer layer of epithelial cells. They are so small that red blood cells need to flow through them single file.

Detailed explanation-4: -In review, the basic structure of a capillary a single layer of simple squamous epithelium, a basement membrane, and few pericytes.