Describe a Weight Bearing Joint

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2a Describe an example of a weight-bearing synovial joint and explain how this joint is well-suited to the function it performs. (Include a description of the type of joint, the movements that the joint allows, and the muscles that facilitate these movements) (2.1) An example of a synovial joint is the knee joint in which it is freely moveable. The knee joint is the largest joint in the body and is a hinge joint which is formed by the condyle of the femur and tibia and the surface which is named the patella. The hinge joint consists of one concave surface and one convex surface where one bone is able to fit into the other bone is has a synovial cavity to reduce friction of the joint during movement. The ends of the bone are covered with smooth articular cartilage; this acts as a sponge and also reduces friction when the joint is moving. A hinge joint produces a similar action to a hinge on a door in that, it makes an open a close movement. The joint allows flexion and extension and a small degree of side to side movement when the knee is flexed. It is enclosed in an articular capsule to unite the articulating bones and ligaments to strengthen it by limited movement. The articular capsule has two layers: -Fibrous capsule: the outer layer - Synovial membrane: the inner layer that secretes synovial fluid which lubricates to reduce friction. The surface of the knee joint, the patella lies within the joint capsule and has an important function which is to reduce friction during extension and to protect the knee joint. The muscles that facilitate the movement of the synovial joints are skeletal muscles. The muscles that move the knee joint are called quadriceps and hamstring. When the agonist which is the contracting muscle which, in this case is the quadriceps, it allows flexion of the knee joint while the antagonist which will be the hamstring, is the relaxed

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