Fig. 1 shows a simplified diagram of the elbow region of a human arm. A student is studying how the bones of the forearm can move without rubbing directly a...
Question 1 Report
Fig. 1 shows a simplified diagram of the elbow region of a human arm. A student is studying how the bones of the forearm can move without rubbing directly against the upper-arm bone. The student has removed the cap covering the outer skin in a digital model so that the structures at the joint can be seen. X and Y are labelled.
(a) Name the structure labelled X. [1]
(b) Name the structure labelled Y. [1]
(c) State how structure X helps movement at this joint. [1]
(d) Which type of joint is the elbow? [1]
Answer Details
(a) X is cartilage. [1]
(b) Y is a ligament. [1]
(c) Cartilage reduces friction between bone ends, preventing them rubbing directly together. It also cushions the ends of bones. [1]
(d) The elbow is a hinge joint. It allows movement mainly in one plane, such as bending and straightening. [1]
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