Right atrium

Right atrium

The right atrium is one of the four chambers of the heart. It receives deoxygenated blood from the body through the superior vena cava and the inferior vena cava, and pumps it into the right ventricle via the tricuspid valve.

Structure

The right atrium is located in the upper right corner of the heart. It is separated from the left atrium by the interatrial septum. The interior of the right atrium is smooth, except for the pectinate muscles, which are located in the atrial appendage. The sinus venarum is the part of the right atrium into which the superior and inferior venae cavae drain.

Function

The primary function of the right atrium is to act as a receiving chamber for deoxygenated blood returning to the heart from the body. Once the right atrium is filled, it contracts (atrial systole), pushing the blood through the tricuspid valve into the right ventricle.

Clinical significance

Conditions that can affect the right atrium include atrial fibrillation, atrial flutter, and atrial septal defect. These conditions can lead to complications such as stroke, heart failure, and pulmonary embolism.

See also

• Heart
• Cardiac cycle
• Cardiovascular system

External links

• MedlinePlus: Right Atrium

Right atrium Resources
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