Capillary

Capillary is the thinnest blood vessel with a diameter of approximately 5-20 microns. Capillaries form networks in most tissues; blood enters the capillaries from the arterioles and flows into the venules. The walls of capillaries consist of only one layer of endothelial cells surrounded by a basal layer, which facilitates the exchange of oxygen, carbon dioxide, water, salts and other substances between the bloodstream and body tissues.

Capillaries are the smallest and thinnest blood vessels in the human body. Their diameter is approximately 5-20 microns, making them much smaller than arteries and veins. In most tissues they form complex networks that play an important role in metabolism and maintaining the vital functions of the body.

Structurally, capillaries are thin tubes, the walls of which consist of only one layer of endothelial cells surrounded by a basal layer. This simple composition of the capillary walls allows for the most efficient exchange of substances between the blood and body tissues.

The function of capillaries is to deliver oxygen and nutrients to the body's tissues, as well as remove carbon dioxide and other metabolic waste from the tissues. Blood enters the capillaries from arterioles, which are small branches of arteries, and then collects into venules, the precursors of veins.

The main feature of capillaries is their high surface area, which ensures maximum contact with surrounding tissues. This allows for the effective exchange of oxygen, carbon dioxide, water, salts and other substances between the blood and tissues of the body. Capillaries play a key role in the process of diffusion, osmosis and filtration, ensuring constant renewal and maintaining homeostasis in the body.

The figure below shows the structure and location of capillaries in body tissues.

[Insert picture of capillary]

In conclusion, capillaries are an important component of the circulatory system, allowing efficient exchange of substances between the blood and body tissues. Their unique structure and function make it possible to support vital processes and ensure the normal functioning of all organs and systems in the human body.

Capillaries are the thinnest blood vessels that play an important role in the body. They are networks located in most tissues of the body and are the site of exchange of substances between blood and tissues.

Capillaries have a diameter of about 5-20 micrometers and consist of a single layer of endothelial cells surrounded by a basal layer. This thin layer allows blood to easily penetrate the capillary wall and allows the exchange of substances between the blood and surrounding tissues. In addition, capillaries ensure the transport of oxygen and carbon dioxide, as well as water and salts in the body.

One of the main functions of capillaries is to provide the body's cells with necessary nutrients and remove waste products. In addition, they are involved in the regulation of body temperature and blood pressure.

However, in some diseases, such as diabetes, the capillary wall can be damaged, which leads to disruption of the blood supply to tissues and deterioration in their functioning.

Thus, capillaries are an integral part of our body and play an important role in many processes associated with life. Their normal functioning is necessary to maintain human health and well-being.