Question

how blood circulation takes place in humans

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Answer 1

Answer:

Blood comes into the right atrium from the body, moves into the right ventricle and is pushed into the pulmonary arteries in the lungs. After picking up oxygen, the blood travels back to the heart through the pulmonary veins into the left atrium, to the left ventricle and out to the body's tissues through the aorta.

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Answer 2

Answer:

By the heart

Explanation:

The deoxygenated blood is Collected by superior and inferior vena cava.

Then it travel to the right auricle and then the tricuspid valves open because of SA node and the deoxygenated blood enters to the right ventricle then it goes through pulmonary artery then to lungs .From lungs it becomes oxygenated and pulmonary vein carries the oxygenated blood to left auricle and the bicuspid valves open to allow the oxygenated blood to aorta(largest artery in our body) and is transported to every part of our body.

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