Want to learn about the anatomy of the left atrium? It’s a pretty important structure! Get comfortable and get watching this video now. Once you’re feeling more confident, why not try this quiz to see how well you learned? [ Ссылка ]

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The atria of the heart, which are singularly known as an atrium, are a pair of blood collecting chambers that comprise two of the four chambers of the heart. The main function of the atria is to facilitate circulation by rhythmically contracting and relaxing their walls, pushing the blood that is returned to them via the major venous vessels, into the ventricles.

The atria are divided into the left atrium and the right atrium, which correspond to the left and right sides of the heart. They are situated just above the ventricles of the heart, and are built and held up by rigid endocardial muscle fibers that completely encompass the blood as it flows through them.

The left atrium is responsible for collecting the outflow of oxygenated blood that runs back to the heart from the pulmonary veins. It passes this volume of blood on to the left ventricle as the atrium contracts and the mitral valve -otherwise known as the bicuspid valve- opens.

In this video, we cover:

0:08 Definition of the atria
0:35 Function of the left atrium
0:57 The mitral valve
1:10 Blood supply and drainage of the left atrium
1:26 The foramen ovale


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