Bone marrow is the flexible tissue found in the interior of bones. In humans, red blood cells are produced in the heads of long bones, in a process known as hematopoesis. On average, bone marrow constitutes 4% of the total body mass of humans; in an adult weighing 65 kilograms (140 lb), bone marrow accounts for approximately 2.6 kilograms (5.7 lb). The hematopoietic compartment of bone marrow produces approximately 500 billion blood cells per day, which use the bone marrow vasculature as a conduit to the body's systemic circulation. Bone marrow is also a key component of the lymphatic system, producing the lymphocytes that support the body's immune system.
Read more about Bone Marrow: Marrow Types, Stroma, Diseases of The Bone Marrow, Examination, Donation and Transplantation, Bone Marrow in Cuisine
Famous quotes containing the words bone and/or marrow:
“Sang a bone upon the shore;
“A man if I but held him so
When my body was alive
Found all the pleasure that life gave”:
A bone wave-whitened and dried in the wind.”
—William Butler Yeats (1865–1939)
“History is fond of her grandchildren, for it offers them the marrow of the bones, which the previous generation had hurt its hands in breaking.”
—Nikolai Gavrilovich Chernyshevsky (1828–1889)