EVERYDAY SCIENCE

Detailed explanation-1: -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. There are two types of bone marrow: red and yellow.

Detailed explanation-2: -Compact bone makes up the outer layer of the bone. Spongy bone is found mostly at the ends of bones and contains red marrow.

Detailed explanation-3: -Located in the spaces, between the trabeculae of some spongy bones is red bone marrow. Blood vessels within red bone marrow supply osteocytes of spongy bone and aid in removing waste products. Red bone marrow also forms the site for hematopoiesis.

Detailed explanation-4: -Red marrow is found in the medullary cavities of flat and short bones, articular ends of long bones, vertebral bodies, spongy bone of the cranium, sternum, ribs, and scapulae.

Detailed explanation-5: -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.