Most red and white blood cells are produced in the bone marrow; however, red blood cells and white blood cells have different functions. Red blood cells transport oxygen from the lungs to other parts of the body and carry carbon dioxide back to the lungs. White blood cells help attack, destroy, and remove foreign substances, bacteria, viruses, fungi, etc. from the body.
While red blood cells and white blood cells circulate side by side in the fluids in blood vessels, they are responsible for different roles in the body. Red blood cells, or hemoglobin, deliver oxygen to the tissues. They travel to the lungs, where oxygen is picked up in the capillaries. With the oxygen bonded to it, the red blood cell returns to the heart, which pumps the blood through the arteries to tissue cells. The deoxygenated red blood cell then returns to the heart. White blood cells, on the other hand, act as the immune system’s defense, fighting against bacteria, viruses, and other invasive substances. While red blood cells are simply just hemoglobin, white blood cells have different parts. T cells and macrophages destroy microbes, whereas B cells create antibodies.
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