Respiration is the process that carries oxygen to the cells and removes carbon dioxide from them. Blood carries the oxygen to the cells.
Oxygen and carbon dioxide are exchanged in body tissues through the process of diffusion. Oxygen in the blood enters the tissue cells, where it is used for cellular respiration. Carbon dioxide, a byproduct of this process, moves from the cells into the blood to be transported back to the lungs for exhalation.
All the cells require oxygen, and so the way of them getting it is via the blood.
The process of getting and using oxygen in the body is called respiration. It involves breathing in oxygen through the lungs, which is then transported by the blood to cells where it is used for cellular functions, and carbon dioxide is expelled as waste through exhalation.
The process is called diffusion
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various reasons. the blood is responsible for delivering oxygen to the cells. as a result anything blocks the blood from reaching the cells will limit the oxygen. or some intoxication such as CO toxicity which replace the place of oxygen in the blood.
Oxygen is carried by red blood cells in the bloodstream and delivered to cells through a process called diffusion. Oxygen diffuses from areas of high concentration in the bloodstream into cells where it is needed for cellular respiration. This process is facilitated by the presence of hemoglobin in red blood cells, which binds to oxygen and releases it when needed by cells.
Red blood cells drop off oxygen to tissues and cells in the body through the process of diffusion in capillaries. Oxygen molecules bind to hemoglobin in red blood cells in the lungs and are released when the red blood cells reach tissues with lower oxygen concentration.
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Oxygen is primarily transported into blood cells by binding to hemoglobin molecules within red blood cells. This process occurs in the lungs where oxygen diffuses from the alveoli into the bloodstream and binds to hemoglobin, forming oxyhemoglobin.
If by that you mean where they get their own oxygen, then from nowhere because red blood cells do not need oxygen, they perform all reactions anaerobically.If you mean where they get it to give off for the rest of your body, then its from the lungs.