How do red blood cells enter the circulatory system?

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Red blood cells are produced in the bone marrow as reticulocytes, which then enter the circulatory system through small pores in the bones. Once they navigate into the nearest capillary, they mature into fully functional red blood cells. The body generates approximately 1 to 2 million red blood cells per second. It is accurate to say that reticulocytes are created in the bone marrow, and they only become fully developed red blood cells upon entering the capillaries.
sameeralord
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Hello everyone,

I just started biology and I have lots of clarifications If red blood cells are created in the bone marrow how do they enter the circulatory system. Do they permeate through the blood vessels?
 
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Red blood cells begin as Reticulocytes in the marrow and navigate through the small pores in the large bones of the body. They are quickly absorbed by the nearest capillary into service. You make roughly 1 - 2 million per second.
 
getitright said:
Red blood cells begin as Reticulocytes in the marrow and navigate through the small pores in the large bones of the body. They are quickly absorbed by the nearest capillary into service. You make roughly 1 - 2 million per second.

Thanks Getitright :smile: So is it wrong when we say red blood cells instead of reticulocytes are created in the bone marrow. Do they only become red blood cells when it enters the cappillary?
 
Correct. Good job.
 

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