Question

After 120 days, red blood cells are removed by macrophages of the reticuloendothelial system. What is the process by which red blood cells are removed from the body?

1) Phagocytosis
2) Exocytosis
3) Apoptosis
4) Endocytosis

Answer 1

Worn-out red blood cells are removed from the body through a process called phagocytosis, where they are engulfed by macrophages located in the bone marrow, liver, and spleen.

Step-by-step explanation:

The process by which red blood cells (erythrocytes) are removed from the body after their lifespan of 120 days is called phagocytosis.

Worn-out red blood cells are engulfed and digested by macrophages, which are a type of myeloid phagocytic cell found in locations such as the bone marrow, liver, and spleen. Upon phagocytosis, the components of the red blood cells, specifically hemoglobin, are broken down, and their parts are further recycled or excreted from the body.