EVERYDAY SCIENCE

Detailed explanation-1: -Bone is made up of compact tissue (the hard, outer layer) and cancellous tissue (the spongy, inner layer that contains red marrow).

Detailed explanation-2: -There are two types of bone tissue: compact and spongy. The names imply that the two types differ in density, or how tightly the tissue is packed together. There are three types of cells that contribute to bone homeostasis.

Detailed explanation-3: -The outside of bones are hard tissues that provide support, but inside those bones are spongy tissues called marrow that produces blood cells. Even during childhood, the bones have softer areas toward the ends that produce more bone tissues to keep out skeleton growing right along with the rest of our bodies.

Detailed explanation-4: -Bone consists of four types of cells: osteoblasts, osteoclasts, osteocytes, and osteoprogenitor (or osteogenic) cells. Each cell type has a unique function and is found in different locations in bones.

Detailed explanation-5: -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. Red marrow contains blood stem cells that can become red blood cells, white blood cells, or platelets. Yellow marrow is made mostly of fat.