Bone Marrow
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.
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Famous quotes containing the words bone and/or marrow:
“We as women know that there are no disembodied processes; that all history originates in human flesh; that all oppression is inflicted by the body of one against the body of another; that all social change is built on the bone and muscle, and out of the flesh and blood, of human creators.”
—Andrea Dworkin (b. 1946)
““A young man in the dark am I
But a wild old man in the light
That can make a cat laugh, or
Can touch by mother wit
Things hid in their marrow bones
From time long passed away....””
—William Butler Yeats (1865–1939)