The heart in birds is four-chambered and consists of the left and right atria and the left and right ventricles. The left and right halves of the heart are completely separated by a solid septum. Therefore, the venous blood of the right half of the heart does not mix with the arterial blood of its left half. From the left ventricle, the right aortic arch departs, through which arterial blood flows to all organs and tissues. From the right ventricle, venous blood enters the lungs, where it is saturated with oxygen, and returns to the left atrium of the heart. Thanks to the four-chambered heart, all cells of the organs and tissues of the bird are supplied with arterial blood, rich in oxygen.
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