Human Genetics Project

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by Sidneymc
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Human Genetics Project

Now, we're going to talk about what the skeleton does. The Human Body is supported by an internal endoskeleton like all other vertebrates. The skeleton supports the body, protects internal organs, provides for movement, stores mineral reserves, and provides a site for blood cell formation.

Next, we'll learn some information on bones of the skeleton. Bones are a solid network of living cells and protein fibers that are surrounded by deposits of calcium salts. Also, the formation of blood cells occurs in the bones, called hemotopoiesis.

Now we're going to learn about joints. A joint is where two bones connect together. Ball-and-socket joints permit movement in many directions. They allow the widest range of movement of any joint. Hinge joints permit back-and-forth motion, like the opening and closing of a door. Pivot joints allow one bone to rotate around another. Gliding joints permit one bone to slide in two directions. These are all freely moveable joints. The joints are surrounded by a joint capsule that keeps the bones together yet allowing them to move. Ligaments hold bones together in a joint and attach to membranes around the bones. In some bones, there is also a bursa, which reduces the friction between the bones of a joint.

Here are some examples of injuries to the skeletal system. Just like any other tissues, bones and joints can be damaged. Excessive strain can cause inflammation, which includes swelling, pain, heat and redness. A more serious condition is arthritits, where the joint itself is inflammed. In older people, loss of calcium in bones can make them weak, called osteoporosis.

Finally, we'll be given information about both part of the skeleton.The axial skeleton supports the central axis of the body. The appendicular skeleton consists of the bones of the arms and legs, bones of the pelvis and shoulder area.

First, we'll learn about the development of the skeleton. As infants, human's have a fontanelle. This is a soft spot where bone does not grow because the developing brain grows faster than the surronding bone. During development, the embroyo is almost completely made up of cartilage. Although very flexible, cartilage can support weight. The process where cartilage turns into bone is called ossification. At the end of long bones, the cartilage is called growth plates, and when the bones are completely ossified, they stop growing.

The Skeletal System

Osteolgy: The study of bones

The tour begins here! In this glog we'll be learning about the sketetal system of the human body.


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