Red bone marrow contains hematopoietic stem cells, which produce blood cells. This type of marrow is one of the major tissues of the lymphatic system -- immature progenitor cells in marrow develop into the various types of white blood cells. Lymphocytes form in red marrow, then travel to the lymphoid organs to mature. The liver, spleen and red marrow destroy old red blood cells.

mphillips007 / Getty Images
This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.