Which of the following statements about red blood cells in human is/are true?

Are released from the bone marrow as mature red blood cells

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Do no contain mitochondria

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Have a life span of 120 days in the circulation

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All of the above

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Solution

The correct option is B All of the above
The bone marrow produces the cellular elements of the blood, including platelets, red blood cells, and white blood cells. Red blood cells are released from bone marrow as matured RBC.
They lack a nucleus and other cell organelles, like mitochondria, at maturity.
When matured, in a healthy individual these cells live in blood circulation for about 100 to 120 days. At the end of their lifespan, they become senescent and are removed from circulation.
So, the correct answer is option D.

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1. They are a type of red blood cell of the lymphocyte subtype

2. Many B cells mature into what are called plasma cells that produce antibodies (proteins) necessary to fight off infections while other B cells mature into memory B cells.

3. B cells mature in the bone marrow, which is at the core of most bones

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