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How do red blood cells enter the circulatory system?

  1. Jul 27, 2009 #1
    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?
  2. jcsd
  3. Jul 27, 2009 #2
    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.
  4. Jul 27, 2009 #3
    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?
  5. Jul 27, 2009 #4
    Correct. Good job.
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