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Skeletal system: Difference between revisions
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==== Spongy ==== | ==== Spongy ==== | ||
The spongy bone is where all of the blood cells are created from the bone marrow. Spongy bone contains two different types of bone marrow: red and yellow marrow. The red bone marrow produces red and white blood cells and platelets. The yellow bone marrow, however, is used to store fats.[http://webschoolsolutions.com/patts/systems/skeleton.htm] | The spongy bone is where all of the blood cells are created from the bone marrow. Spongy bone contains two different types of bone marrow: red and yellow marrow. The red bone marrow produces red and white blood cells and platelets. The yellow bone marrow, however, is used to store fats.[http://webschoolsolutions.com/patts/systems/skeleton.htm] | ||
=== Joints === | === Joints === | ||
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==== Pivot ==== | ==== Pivot ==== | ||
[[Image:Vertebral column.png|250px|thumb|right|Human vertebral column]] | |||
The pivot joint allows for the most movement out of all of the joints. The most common example of this joint is the neck, which can look from side to side, up and down, and almost any way at all. This joint is used primarily to be able to see your surroundings without turning your whole body. This helps when you are driving or carrying large objects, but other than that, there is little else that it can do. | The pivot joint allows for the most movement out of all of the joints. The most common example of this joint is the neck, which can look from side to side, up and down, and almost any way at all. This joint is used primarily to be able to see your surroundings without turning your whole body. This helps when you are driving or carrying large objects, but other than that, there is little else that it can do. | ||
