2.
Write the name of the joint in each box.
Answers
The anatomy of our musculoskeletal system is quite complex. It consists of a large number of tendons, ligaments, bones, cartilage, joints, and bursae. We are able to control our muscles by sending stimulating impulses via nerves from our brain. The muscles are attached to the bones via rope-like structures called tendons. Our skeletal system is made up of over 200 individual bones. Ligaments are strong ligamentous structures that typically anchor bones to one another. Bursae are small fluid-filled sacs that typically exist at high friction points near joints. They act to protect ligaments and tendons from rubbing against bare bones.
The Skeleton
Labeled Skeleton System
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Our skeleton consists of a strong and solid internal framework of bones within our body. The bones of the skeleton give our body its shape, protect and support our organs, brain and spinal cord, and make it possible for us to move. Bones do not move on their own; muscles move our bones by pulling on them. Muscles cannot push against the bone, so muscles typically come in pairs (known as antagonists), one muscle pulls the bone one way and the antagonistic muscle pulls the bone back the other way.
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Structurally, bones are somewhat elastic because they are primarily made up of collagen. Hydroxyapatatite, which consists mainly of calcium and phosphate, gives bone its hardness.
Most bones (particularly the long bones of the arms and legs — which make up the appendicular skeleton) have a hard outer shell known as cortical bone. At the microscopic level, this hard outer shell is made up of rod like structures called osteons. Within the hard outer shell, exists an area made up of spongy bone, known as cancellous bone. Finally, many bones have an inner core that houses a jelly like substance called marrow.
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