MCAT Question A Day - 9/15/14 - Answer!
In a synovial joint. the purpose of the synovial fluid is to:
A. reduce friction between bone ends.
B. keep bone cells adequately hydrated.
C. occupy space until the bones of the joint complete their growth.
D. maintain a rigid connection between two flat bones.
A is correct. Synovial fluid acts as a lubricant, decreasing friction between the ends of the bones as they move. Bone cells receive circulation to keep them adequately hydrated; they do not need synovial fluid for this purpose. B is out. Synovial fluid persists in adults, after bones have stopped growing, so we know C is wrong. Synovial fluid is found in synovial joints, which allow movement. Its purpose is not to prevent movement. D is out.
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A is correct. Synovial fluid acts as a lubricant, decreasing friction between the ends of the bones as they move. Bone cells receive circulation to keep them adequately hydrated; they do not need synovial fluid for this purpose. B is out. Synovial fluid persists in adults, after bones have stopped growing, so we know C is wrong. Synovial fluid is found in synovial joints, which allow movement. Its purpose is not to prevent movement. D is out.
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