The human body needs oxygen to survive because it is used in the process of cellular respiration. Cellular respiration is the process by which cells produce energy. In cellular respiration, oxygen is used to break down glucose, a sugar, into carbon dioxide and water. This releases energy, which is used by the cells to do their work.

If the body does not get enough oxygen, the cells will not be able to produce enough energy. This can lead to a number of problems, including fatigue, shortness of breath, and even death.

There are a number of things that can interfere with the body’s ability to get enough oxygen. These include:

• Lung diseases: Lung diseases, such as asthma and chronic obstructive pulmonary disease (COPD), can make it difficult to breathe and get enough oxygen into the lungs.
• Heart disease: Heart disease can make it difficult for the heart to pump blood to the lungs, which can also reduce the amount of oxygen that reaches the cells.
• High altitude: At high altitudes, the air is thinner, which means that there is less oxygen in the air. This can make it difficult to breathe and get enough oxygen into the body.
• Anemia: Anemia is a condition in which the body does not have enough healthy red blood cells. Red blood cells carry oxygen to the cells, so having too few red blood cells can mean that the cells do not get enough oxygen.

If you are experiencing shortness of breath, fatigue, or other symptoms of not getting enough oxygen, it is important to see a doctor to determine the cause and get treatment.