Lets oxygen-rich blood from your lungs pass from the left atrium into the left ventricle through four pulmonary veins.
The heart functions as a pump and typically beats 60 to 100 times each minute. The heart pumps blood throughout our body with each beats, supplying oxygen to every cell. Blood returns to the heart after supplying oxygen. The blood is subsequently sent to the lungs by the heart so that it can absorb additional oxygen. This loop keeps happening over and over.
Blood arteries in the circulatory system move blood away from and toward the heart. Blood leaves the heart through arteries and returns through veins. Cells receive oxygen, nutrition, and hormones through the circulatory system, which also eliminates wastes like carbon dioxide. To keep things moving in the right direction, these roads only go in one direction.
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