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질문할 때 예의를 지키시기 바랍니다.(빨리... 고수분만..... 이런 식의 요구는 자제 바랍니다.)
질문 내용 :
The amount of oxygen needed at any one time depends upon what the person is doing.
As the activities of the body increases, the use of oxygen also increase.
The person begins to breathe deeper and faster to bring more oxygen into the lungs.
More res cells are thrown into the bloodstream to aim in carrying the added supply of oxygen.