Fig. 1 shows a cross-section of a ball and socket joint found in the body of a performer. (a) Give one location in the body where this type of joint is foun...
Question 1 Report
Fig. 1 shows a cross-section of a ball and socket joint found in the body of a performer.
(a) Give one location in the body where this type of joint is found. [1]
(b) Describe one feature of this joint that allows a wide range of movement. [1]
(c) State the function of the synovial fluid found inside this joint. [1]
Answer Details
(a) This type of joint (ball and socket) is found at the hip or the shoulder. [1] Both locations feature the rounded head of one bone fitting into a cup-shaped socket of another.
(b) One feature that allows a wide range of movement: the rounded head of one bone fits into a deep, cup-shaped socket of the other bone, which permits movement in all directions and multiple planes, including flexion, extension, abduction, adduction, rotation and circumduction. [1] Another acceptable answer is that the joint capsule is sufficiently loose to allow a wide range of movement.
(c) The synovial fluid found inside the joint acts as a lubricant, reducing friction between the articulating surfaces of the bones during movement. [1] This allows smooth, pain-free motion at the joint. It also acts as a mild shock absorber and provides nutrients to the articular cartilage.
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