There are 6 different cells in the skeletal system. There are yellow marrow cells, red marrow cells, osteoblasts, osteoclasts, and periosteum (connective tissue). Osteoblasts create bone by taking proteins and minerals (like phosphorous and calcium) from the blood, and combining them to make basic bone tissue. Osteoclasts absorb the mixture, using enzymes, and deposit it in blood. Osteoblasts and osteoclasts can be found in compact bone. Red marrow cells are found in spongy bone, and produce red and white blood cells, contrary to the misconception that the heart generates blood cells. Capilaries in the bone allow for the blood cells to enter the blood stream. Yellow marrow is found in the middle of long bones. It is made mostly of fat cells, and does not generate anything naturally. All marrow is red at birth, and is changed to yellow as a person gets older. In the case of severe blood loss, yellow marrow will be converted into red marrow. It is a place holder. Periosteum is the protective outer covering of bone. It is made of connective tissue, and allows for muscles to attach to bone.
Compact bone, with bone cells and connective tissue
There are 6 different cells in the skeletal system. There are yellow marrow cells, red marrow cells, osteoblasts, osteoclasts, and periosteum (connective tissue). Osteoblasts create bone by taking proteins and minerals (like phosphorous and calcium) from the blood, and combining them to make basic bone tissue. Osteoclasts absorb the mixture, using enzymes, and deposit it in blood. Osteoblasts and osteoclasts can be found in compact bone. Red marrow cells are found in spongy bone, and produce red and white blood cells, contrary to the misconception that the heart generates blood cells. Capilaries in the bone allow for the blood cells to enter the blood stream. Yellow marrow is found in the middle of long bones. It is made mostly of fat cells, and does not generate anything naturally. All marrow is red at birth, and is changed to yellow as a person gets older. In the case of severe blood loss, yellow marrow will be converted into red marrow. It is a place holder. Periosteum is the protective outer covering of bone. It is made of connective tissue, and allows for muscles to attach to bone.