Continuous Capillaries: Structure, Function & Key Features

Continuous capillaries are the most common type of capillary and are found in most tissues. They have the following features:

- Endothelial cells: The capillaries are lined by a single layer of endothelial cells that are joined together by tight junctions. Tight junctions are specialised cell-cell junctions that prevent the passage of molecules between cells. This means that solutes can only enter and leave the capillaries by passing through the endothelial cells.

- Basement membrane: The endothelial cells are surrounded by a basement membrane, which is a thin layer of connective tissue. The basement membrane provides support for the endothelial cells and helps to maintain the integrity of the capillary wall.

- Fenestrations: Some continuous capillaries have fenestrations, which are small pores in the endothelial cells. Fenestrations allow for the passage of small molecules, such as water and ions, between the blood and the interstitial fluid.

Continuous capillaries are found in a variety of tissues, including the skin, muscles, and organs. They play an important role in the exchange of nutrients and waste products between the blood and the tissues.