Cardiovascular Composition

Cardiovascular is composed of heart and blood vessels, and blood vessels also include arteries, veins and capillaries.

(A) heart

The heart is the power organ that drives the blood flow, divided into four chambers. Ie left, right atrium, left and right ventricles.

(B) arteries

The arteries are blood vessels that bring blood out of the heart.

(C) intravenous

A vein is a blood vessel that brings blood back to the heart.

(4) capillaries

Capillary is attached to the arteries and veins between the diameter is very fine, very thin tube wall.

The main function of the heart is to give the body oxygen and remove the body of metabolites (such as carbon dioxide, etc.). In short, the heart is through the body to collect hypoxic blood, and pumped into the lungs, after a full gas exchange, the heart of oxygen-rich blood pumped to the body tissues and organs to complete its function.

Heart function

Cardiovascular Each heart stroke includes diastolic (heart chamber relaxation and filling of the blood) and systolic (cardiac systolic pump). The two atria are contracted and diastolic, and the two ventricles are contracted and diastolic, but the atrial and ventricular movements are not synchronized.

Cardiovascular The following simple talk about the flow of blood in the heart of the process. First, the hypoxic and carbon dioxide-rich blood from the body flows back to the right atrium through two of the largest venules (vena cava). When it is filled, push the blood into the right ventricle. Then, through the pulmonary valve, the right ventricle will pump blood into the pulmonary artery into the lungs. In the lungs, blood flows through a small capillary bed that is widely distributed around the alveoli and exchanges gas with the gas in the alveoli, absorbing oxygen and releasing carbon dioxide, which is exhaled through exhalation. Subsequently, these oxygen-enriched blood flows into the left atrium through the pulmonary vein. Medical, the right heart - lung - left atrial circulation called the pulmonary circulation. When the left atrium is filled, push these oxygen-enriched blood into the left ventricle. Then, through the aortic valve to the blood pumped into the body's largest artery - the aorta. These oxygen-rich blood will supply all organs except the lungs.

The inner view of the heart

Show the normal blood flow in the direction of the heart.