Oxygen is vital to organisms that have aerobic respiration. How can you ensure that you are breathing clean air with oxygen?
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Answer:
With each breath you exchange the gases oxygen (O2) and carbon dioxide (CO2). Why is this exchange important? Why does your body need oxygen? What happens to the CO2? Where do we get O2? These are some of the questions that this section will help you answer.
Every cell in your body needs oxygen to function. You get the oxygen your cells need from the air you breathe. The air you breathe is made up of 20 percent oxygen. The rest of the air is mostly nitrogen (79%). Your body cells use the oxygen you breathe to get energy from the food you eat. This process is called cellular respiration. During cellular respiration the cell uses oxygen to break down sugar. Breaking down sugar produces the energy your body needs. This is very similar to wood burning in a fire. As the wood burns, it combines with oxygen and releases heat energy and carbon dioxide. When the cell uses oxygen to break down sugar, oxygen is used, carbon dioxide is produced, and energy is released. But instead of heat energy, much of the energy produced in cellular respiration is stored chemically for the cell to use later. Carbon dioxide is the waste product of cellular respiration that you breathe out each time you breathe. Blood picks up oxygen and releases carbon dioxide in the lungs. The opposite takes place in the cells where the blood releases oxygen and picks up carbon dioxide.
The Breath of Life
Think about where the O2 you inhale comes from and where the CO2 you exhale goes. The exchange of gases doesn't only take place in the cells in your body. Actually, gas exchange is taking place all around you. In fact, oxygen and carbon dioxide are involved in the most important relationship that exists between plants and animals.
Explanation:
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