O-LevelBiologyCoordination & Response5090/11 · May/June 2016 · Q191 Mark
Which statement about the elbow joint is true?
AIf the biceps contracts, the triceps must relax.
BThe biceps and triceps can both be partially contracted.
CWhen the biceps relaxes it returns at once to its original length.
DWhen the biceps contracts it straightens the arm at the elbow.
✓ Correct answer
B: The biceps and triceps can both be partially contracted.
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