Every cell in your body needs oxygen to help it metabolize (burn) the nutrients released from food for energy. ... Cells that do the same job combine together to form body tissue, such as muscle, skin, or bone tissue. Groups of different types of cells make up the organs in your body, such as your heart, liver, or lungs.
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Every cell in your body needs oxygen to help it metabolize (burn) the nutrients released from food for energy. ... Cells that do the same job combine together to form body tissue, such as muscle, skin, or bone tissue. Groups of different types of cells make up the organs in your body, such as your heart, liver, or lungs.