Bone

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
The bones of a human foot
For the television series, see Bones (TV series)

Bones are parts of the human or animal skeleton of vertebrates. They are stiff organs which make up the endoskeleton. Our body is made of flesh and blood built on a framework of bones. Without our bones, we could not stand up or move about. They also protect organs inside our body.[1] The skull protects the brain and the ribs protect the heart and lungs. The jaw and cheekbones support the facial muscles, which help us smile. The number of bones in a human's neck is the same as a giraffe's.[1]

Function[change | change source]

The bones are the framework of the body. Without them we would be a pile of organs on the ground and would not be able to move. The bones are also very important for our protection, that is, the rib cage protects the heart and lungs, cranium (skull) protects the brain, pelvis protects the reproductive organs, vertebrae protect the spinal cord. Bones need to be maintained by taking regular exercise and by having lots of calcium from foods like milk, and dark leafy greens such as spinach. The red bone marrow in the middle of the bigger bones is what makes the red blood cells that we need.


Bone marrow[change | change source]

Long bones are hollow, with a central core which is not strong like the rest of the bone. It contains the bone marrow, one of the most important tissues in the vertebrate body. It produces blood cells for the blood system, and lymphocytes for the immune system.

Diagram of a typical long bone: shows compact (cortical) and cancellous (spongy) bone

References[change | change source]

  1. 1.0 1.1 My First Book on the Human Body. Bath: Robert Frederick. 2004. ISBN 0-7554-3506-0.