What is the structure of the circulatory system?

The structure of the circulatory system is a complex network of pump and blood vessels that transports nutrients and oxygen throughout the body. The blood travels through the circular system. The heart draws blood into all parts of the body and in a minute this blood returns to the heart to be exhausted again. The blood carries various materials to their destinations in the body, including oxygen and nutrients. All cells of the body obtain their sources from the circulatory system, either directly or indirectly, depending on their blood vessels.

The heart of the circulatory system is the heart of its center. The left side of the heart performs systemic circulation, draws blood into the body and the right side of the heart draws blood into the lungs and undergoes lung circulation. Each side of the heart consists of two chambers, one above the other, connected valves that only provide blood in one direction. The upper chamber is called the atrium, while the lower chamber is called the chamber. Blood enters the heart through the atrium, then flows into the chamber and is exhausted.

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vessels that carry blood rich in the heart from the heart are called arteries that branch into smaller arteriols and eventually into small capillaries that can allow only one blood cell. The walls of the artery and the walls of some arteriols are relatively strong, so they can handle blood pressure that is exhausted from the heart. This is a particularly beneficial way to optimized the circulatory system structure; The extra thickness of the blood vessels near the heart provides protection against possible rupture and the main disturbance of blood flow.

containers carrying blood -respected oxygen back to the heart are called veins, and the smallest of them that connect to the capillaries, called venules. The veins and vens are thin -walled compared to arteries because they are further from the heart and may not be so strong that they can handle the pressure from blood flow. This is another optimization of the circulatory system structure and creates tubes that are not reinforced unless necessary. PopularThe idea is that the veins are blue, but they are not really; They look in this way because of the refraction of light through the skin. The related idea that blood -respected blood is blue is also false.