human travel systems
We would like to take you on a marvelous trip through the skeletal system. In this trip you will view such sites as the working joints and bones and also the composition of the bone. We can’t give away the whole trip quite yet so sit back and enjoy the ride.First we enter the body by being miniaturized and we will enter as given a shot into the tibia. Now that we are inside the bone we will look at how the bone is built, and made up of. Bones are very strong. They are compared to concrete, or cast iron. Some bones can withstand pressure of 220kg pscm. About 45% of the material of a bone are nonliving. The minerals are usually calcium and phosphorus; they give the bone strength. Living cells & blood make up 30% and 25% water. Bones have three layers. The first is a thin covering of cells that form a tough protective membrane are the bone. A membrane called the periosteum surrounds individual bones. The second layer is a hard, white, rocklike mineral. The last layer of the bone is the marrow. It is lighter than the other materials. Although all bones don’t have the same three layer setup. Short bones and many flat bones are mostly sponge, surrounded by a thin layer of hard bone. As children
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Some common words found in the essay are:
Travel Systems, skeletal system, joint allows, hinge joint, joint joint, joint joint allows, calcium phosphorus, ball socket joint, trip skeletal system, human body, ball socket, socket joint, type joint, bone bone,
Approximate Word count = 1079
Approximate Pages = 4 (250 words per page double spaced)
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