Question

Define Pathway of oxygen?

Answer 1

Blood flows through our bodies via fine capillaries in the walls of our lungs' air sacs. Those air sacs are called alveoli. The oxygen molecules undergo a change once they are inside the body.

Answer 2

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Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. ... Cells have many parts, each with a different function