What are Bones: Defines, Mades & Facts

Every living being consists of bones. Bones make up the framework of the bodies. Bones are living, growing, changing parts of our bodies. Baby’s skeletons are made up of more than 300 parts but by this time we adults have only 206 bones.

By the time we have finished growing at about 25 years old our bones are as big as that is going to get. The bone of the skeleton helps in giving us shape and the posture.

The spinal code helps our backbone and leg bone to stand erect. Bones have four parts the outside part if the bone is called the periosteum which is a thin but very dense layer that has the nerves and blood vessels which nourish the bone. Then is the compact bone which is very smooth and hard.

Cancellous bone looks a bit like a sponge but is much stronger and the very inside of many bones is the bone marrow which looks a bit like a jelly and it makes new blood cells for the body.

What are your bones made out of?

What are your bones made out of

The marrow in spongy bone is red. It makes and repairs the hard parts of the bone. It also builds the cells that make your blood red.

The bones are made mostly of collagen, bone is living, growing tissue. Collagen is a protein that provides a soft framework, and calcium phosphate is a mineral that adds strength and hardens the framework. This combination of collagen and calcium makes bone strong and flexible enough to withstand stress.

What is blood in bones?

What is blood in bones

Bone marrow is the tissue comprising the center of the large bones. It is the place where new blood cells are formed. Bone marrow contains two types of stem cells. The supply of blood to long bones is profuse and derived from a number of sources. There are two types of bone marrow in the red marrow also known as myeloid tissue and yellow marrow. The red blood cells platelets and most white blood cells arise in red marrow and some white blood cells develop in the yellow marrow. The yellow color marrow is due to a much higher number of fat cells. Both types of bone marrow contain numerous blood vessels and capillaries. During the birth all the bone marrow is red but with age, it starts turning in yellow type. Red marrow is found mainly in the flat bones such as hip bone, breast bone, skull, ribs, vertebrae and shoulder blades and in the cancellous a spongy material at the proximal ends of the long bones femur and humerus.

Bone facts:

Bone facts

  • The periosteum is the outer surface of the bone. It is thin and dense and contains the blood vessels and nerves that help to nourish the bone.
  • The compact bone is the layer under the periosteum and is hard and smooth. This is the outer layer that appears on a skeleton.
  • The cancellous part of the bones is inside the compact bone and consists of many layers. This looks similar to a sponge and is hard but not as hard as the compact bone.
  • The bone marrow is inside the cancellous part of the bone. It is similar to thick jelly. The bone marrow creates the blood cells in the body.
  • Bones are made up of the protein collagen, sodium, calcium, phosphorus, and other minerals.

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