bone marrow :)
The substance in the center of the bones is called Bone Marrow. There is yellow marrow and red marrow.
stem cell
bone marrow
MARROW, bone marrow makes blood cells.
Hydroxylapatite is the mineral substance in bone. It is a calcium compound.
Bone marrow is in the center of bone. It produces immature red blood cells.
The Bone Marrow
bone marrow
Antlers are solid bone. There is marrow at their center. The marrow is a hard substance that, if the antler were sliced, could be poked out. But no, antlers are not hollow.
Red bone marrow.
center
Bone marrow.