parts and functions: human heart

 9 parts of the Human heart and their functions

Superior vena cava

The superior vena cava is a vein in the body that transports deoxygenated blood to the right atrium of the heart, and it is as well known as the precava. This vein is short in length; nevertheless, it is very broad in diameter. The right and left brachiocephalic veins lead to the formation of the vein.


The aorta is the largest artery in the body. The aorta starts at the top of the left ventricle, the heart’s muscular pumping chamber. The heart pumps blood from the left ventricle into the aorta via the aortic valve. The aorta is a tube about a foot long and just above an inch in diameter.

Pulmonary artery

The pulmonary artery carries deoxygenated blood from the heart to the lungs. It is one of the only arteries (other than the umbilical arteries in the fetus) that carry deoxygenated blood. In the human heart, the pulmonary trunk (pulmonary artery or main pulmonary artery) starts at the base of the right ventricle.

Pulmonary vein

The pulmonary veins are large blood vessels that receive oxygenated blood from the lungs and discharge into the left atrium of the heart. There are four pulmonary veins, two from each lung. The pulmonary veins are among the few veins that carry oxygenated blood. Two pulmonary veins emerge from each lung hilum, receiving blood from three or four bronchial veins apiece and draining into the left atrium

Left atrium

The left atrium is one of the four chambers of the heart, located on the left posterior side. Its primary roles are to act as a vessel for blood returning from the lungs and to act a pump to transport blood to other regions of the heart.

Left ventricle

Left ventricle is the left lower chamber of the heart that receives blood from the left atrium and pumps it out under high pressure via the aorta to the body. The left ventricle is one of four chambers of the heart and the thickest of all the chambers. It pumps oxygenated blood to tissues all over the body.

Right ventricle

The right ventricle is a heart chamber responsible for pumping deoxygenated blood to the lungs. The right ventricle is one of four of the heart’s chambers and is located in the lower right portion of the heart below the right atrium and opposite the left ventricle. The deoxygenated blood flows into the right atrium, through the tricuspid valve and into the right ventricle.

Inferior vein cava

The inferior vena cava is the largest vein in the human body. It receives blood from veins serving the tissues inferior to the heart and transports this blood to the right atrium of the heart. Even though the vena cava is very large in diameter, its walls are extremely thin as a result of the low pressure exerted by venous blood.

Right atrium

The right atrium is one of the four hollow chambers of the core of the heart. It is situated in the upper right corner of the heart superior to the right ventricle. Deoxygenated blood entering the heart through veins from the tissues of the body first enters the heart through the right atrium.

Author: TheGoldendiamond

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