Function of Cardiovascular System

The main function of the cardiovascular system is to move oxygen and other essentials throughout the body where cells can use them to nurture the growth and proper functioning of human tissue.

Movement of Blood within the Heart

This blood enters the thin-walled right atrium, the first area of the right side of the heart to receive blood. With atrial contraction the blood is pumped through the open tricuspid valve (an atrioventricular valve) into the right ventricle, which has thicker walls than the atrium. The tricuspid valve then closes.

The right ventricle contracts and squeezes the blood though the open pulmonary valve (a semilunar valve) into the pulmonary artery where it flows to the pulmonary capillaries in the lung.

Function of Cardiovascular System:
Oxygenation of Blood

Oxygen in the alveoli of the lung passes through a thin membrane and enters the blood where it joins to the hemoglobin in the red blood cells. Carbon dioxide moves across the membrane out of the pulmonary capillaries into the alveoli to be exhaled.

See an image of capillaries

The blood then flows from the pulmonary capillaries through the pulmonary venous system into the left atrium. The blood moves from the left atrium through the mitral valve (atrioventricular valve) into the powerful left ventricle as the left atrium contracts. The mitral valve then closes.

The left ventricle contracts and pumps blood through the open aortic valve (a semilunar valve) into the aorta, where it is distributed to arteries and eventually the capillaries throughout the body.

Function of Cardiovascular System:
Liver, Kidney, and Cells

The liver can detoxify chemicals and return themed to regular circulation. In the kidneys the end products of metabolism, including detoxified materials, are excreted in the urine. In the systemic capillaries, oxygen moves out into the cells and carbon dioxide moves from the cells into the capillaries. At the same time, products of metabolism move from the cells into the capillaries to be transmitted to the liver for detoxification and to the kidneys for excretion.

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