EVERYDAY SCIENCE

Detailed explanation-1: -Compact bone makes up the outer layer of the bone. Spongy bone is found mostly at the ends of bones and contains red marrow. Bone marrow is found in the center of most bones and has many blood vessels.

Detailed explanation-2: -Bone marrow is a spongy, soft tissue that resembles a jelly or jam that you would spread on toast. It comes in two colors, red and yellow. Bone marrow fills the cavities of your bones and holds cells that create red and white blood cells and platelets, which make whole blood.

Detailed explanation-3: -Compact bones are present in the outer layer of long bones, while spongy bones are present in the middle of the long bones. The main difference between spongy and compact bones is their structure and function.

Detailed explanation-4: -In adult humans, bone marrow is primarily located in the ribs, vertebrae, sternum, and bones of the pelvis. Bone marrow comprises approximately 5% of total body mass in healthy adult humans, such that a man weighing 73 kg (161 lbs) will have around 3.7 kg (8 lbs) of bone marrow.

Detailed explanation-5: -Spongy (cancellous) bone is lighter and less dense than compact bone. Spongy bone consists of plates (trabeculae) and bars of bone adjacent to small, irregular cavities that contain red bone marrow. The canaliculi connect to the adjacent cavities, instead of a central haversian canal, to receive their blood supply.