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Sagot :
Answer:
Explanation:
The human circulatory system has three key components: blood vessels, blood, and the heart. It is called a double circulatory system because blood passes through the heart twice per circuit.
The right pump sends deoxygenated blood to the lungs where it becomes oxygenated and returns to the heart.
The left pump sends the newly oxygenated blood around the body. When this blood returns to the heart, it has returned to a deoxygenated state.
Blood Passes Through The Heart Twice Per Circuit
Blood enters the heart:
Deoxygenated blood from the body enters the right atrium of the heart.
Blood pumped to lungs:
The right ventricle pumps this deoxygenated blood out of the heart and towards the lungs.
Lungs oxygenate the blood:
In the lungs, the deoxygenated blood exchanges carbon dioxide for oxygen. This is how it becomes oxygenated (contains oxygen).
Blood returns to the heart:
Oxygenated blood returns to the left atrium of the heart.
Blood pumped into the body:
This oxygenated blood is pumped out of the heart and to the body by the left ventricle.
Blood returns to the heart:
The oxygenated blood gives its oxygen to body cells in exchange for carbon dioxide. The blood becomes deoxygenated and returns to the heart.
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