Final answer:
The body replaces immune cells and red blood cells through a process called hematopoiesis, which occurs in the bone marrow. Immune cells like white blood cells defend the body while red blood cells carry oxygen. Both types of cells are constantly being produced and replenished in the bone marrow.
Step-by-step explanation:
The body replaces immune cells and red blood cells through a process called hematopoiesis. Hematopoiesis occurs in the bone marrow, which is a spongy tissue found inside the bones. In the bone marrow, stem cells differentiate into various types of blood cells, including immune cells and red blood cells.
Immune cells, such as white blood cells, are involved in defending the body against infections and diseases. They are constantly being produced and replenished in the bone marrow to maintain a healthy immune system.
Red blood cells, on the other hand, carry oxygen throughout the body. They have a lifespan of about 120 days, after which they are removed from the bloodstream. New red blood cells are continuously produced in the bone marrow to replace the ones that have died.
Learn more about The body's replacement of immune cells and red blood cells