Why do we need a skeleton? Detailed answer

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Why do we need a skeleton? Detailed answer

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Why do we need a skeleton?

The skeleton has two main jobs - it supports our body in an upright position and protects the internal organs. The skeleton is a frame made up mostly of bones. At birth, a baby's skeleton contains about 270 bones, some of which are quite small. An adult usually has 206 bones because some of them fuse together. In joints, the bones are held together by ligaments that resemble cords or twine. Some connections are very mobile.

For example, when you run, you move your legs at the knee and hip joints. When you throw the ball, your arm moves at the shoulder and elbow joints. Some joints, or joints, are generally immobile. At the base of the spine, the bones have fused, forming one bone plate that fits into another. None of them move. All joints of our skull are also motionless, with the exception of the jaw. The protection provided by the skeleton includes the hard bony covering of the skull that protects the brain.

The rib cage protects the heart and lungs. And the spine protects the spinal cord - the highway for nerve endings. The spine is a chain of smaller bones.

It's hard for us to imagine that bone is living matter, but that's the way it is. When a person is young, bones grow. For example, the hip can triple in size from birth to full height. Bones increase in length and thickness as they receive calcium and other minerals. And since bone is a living tissue, it must be nourished.

On the outside, the bone has a thin, hard coating that contains many tiny blood vessels that carry nutrients to the bone cells. Inside the bone is porous and filled with bone marrow. Part of the bone marrow contains stores of fat, while the other part produces red blood cells.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

How did Europeans cross two Indian symbols of war and peace?

The most famous weapon of the Indians is the tomahawk, which they knew how to throw and use in close combat. In addition, ritual tomahawks served as a symbol of war and peace - it is from the Indians that the expression "bury the hatchet" comes. Having learned these customs, the Europeans crossed this weapon with another symbol - the peace pipe. To do this, the handle of the tomahawk was made hollow, turning it into a mouthpiece, and the cup of the pipe was on the other side of the blade. Such gifts were in great demand by the Indian leaders, whose support the colonists wanted to enlist.

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