Bones and Muscles- How We Move

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1. Explain the difference between spongy and compact bone and where each is primarily located. The main difference between spongy bone and compact bone is pretty obvious, the density of how they are made. Because spongy bone is somewhat squishy and very porous like a sponge (hence the name), it is much softer then compact bone, which is the hard bone the usually covers spongy bone. Spongy bone is also made up of primarily red bone marrow giving it a red look, while compact bone is made up of yellow bone marrow which gives it the yellow tint. Spongy bone is primarily located inside the bone and is usually entrapped by compact bone, which gives the spongy bone some protection and some structure. 2. Explain the process of bone remodeling and the maintenance of bone density throughout life. How does this relate to osteoporosis? Bone remodeling, by definition, is a continuous process of bone resorption and formation for the purpose of maintaining normal bone mass. Normal bone mass is very good because it means you have healthy bones. Bone remodeling continues to function as long as the body is living, and helps keep your bones strong and whole. Over time, the body will wear and your bones could fracture, so the body counteracts by creating new bone in place of the old broken bone. This relates to osteoporosis, which is what happens when a bone fractures but can’t repair it the correct way so it takes much longer to heal and can cause massive amounts of pain. 3. Name the 6 types of synovial joints and explain how the structure relates to the function in the body. Gliding joints- Allow smooth movement in all directions along a plane or smooth surface. This joint is essential in allowing movement in multiple directions with ease. Condyloid joints- Very similar to gliding joints, except they differ in the surface that the joint moves on, for condyloid joints

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