Question

RBC are short lived due to

Answer 1

red blood cells oxygenated blood

Answer 2

Absence of nucleus or mitrochondria
Red blood cells are manufactured by bones all over the body—in the sternum, ribs, skull, arms, spine and pelvis. The actual factory is the red bone marrow, located at bone ends. As red cells mature and are ready to enter the bloodstream, they lose their nuclei to become what are called red corpuscles or erythrocytes . With no nucleus, a red corpuscle is relatively short-lived (120 days). Thus, the red cell supply must be constantly replenished by bone marrow. And a busy factory it is because 20 to 25 trillion red corpuscles normally travel in the circulation. The spleen is responsible for ridding the body of the aged corpuscles, but it is not an indiscriminate sanitizer; it salvages the hemoglobin for reuse by the body.