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Where are Red Blood Cells, produced? What is the average life span of a RBC?

Answer 1

Red blood cells are produced in the bone marrow. Mature RBC's have a life span of approximately 120 days.

Red blood cells are produced in the bone marrow . Stem cells in the bone marrow develop in several steps to mature red blood cells (RBC):

stem cells #-># progenitor cells #-># precursor cells (blasts) #-># mature cells (see image below).

It takes about 21 days for a stem cell to develop in the bone marrow into a so called reticulocyte. This cell is released into the blood stream and circulates there for 1 to 2 days before it is developed into a mature RBC (erythrocyte).

Once they are matured, an RBC remains functional in the bloodstream for about 110 to 120 days before it is degraded.

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Answer 2

Carson Allen

Red blood cells are produced in the bone marrow. The average life span of a red blood cell is approximately 120 days.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.