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"1) In one part does an air enter firts? 2) Where does the exchange of oxygen and carbon dioxide take palce? 3)Why does a person need oxyg

"1) In one part does an air enter firts? 2) Where does the exchange of oxygen and carbon dioxide take palce? 3)Why does a person need oxygen? 4) Which is the main part of circulatory system? 5)Why does the heart need to pump the blood?"

Asked by: Guest | Views: 48
Total answers/comments: 1
Guest [Entry]

"1)The nasal cavity in other words the nose

2)I think it happens in the lungs or......... plants?

3)To breath

4)The heart

5)The blood that the heart pumps is de-oxygenated blood and de-oxygenated blood cannot be distributed to the different part of the body unless it is oxygenated blood"