Muscles, tendons and ligaments interact to enable movement. The diagram shows some muscles in an arm. (i) Name the two types of skeletal muscle that are contracted when the arm is held in this position. (1) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ (ii) Describe how the arm could be straightened by the muscles labelled $$\(A\)$$ and $$\(B\)$$. (2) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................
Exam No：wbi15-01-que-20240608 Year：2024 Question No：1(b)
Answer:
flexor and extensor
A description that includes two of the following points:
- (more) contraction of \{A / triceps / extensor\} muscle and relaxation of \{B/biceps / flexor\} muscle (1)
- would \{pull on / lower / move down\} the bones (of the lower arm/radius/ulna) (1)
- \(A\) and \(B\) are antagonistic (pairs) (1)
A description that includes two of the following points:
- (more) contraction of \{A / triceps / extensor\} muscle and relaxation of \{B/biceps / flexor\} muscle (1)
- would \{pull on / lower / move down\} the bones (of the lower arm/radius/ulna) (1)
- \(A\) and \(B\) are antagonistic (pairs) (1)
Knowledge points:
CH7 – Respiration, Muscles and the Internal Environment
Solution:
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