Biology 5090 · O Level · Specialised cells, tissues and organs

Specialised cells, tissues and organs — practice question

The diagram illustrates the bones and muscles of the elbow joint. Which statement describes the type of muscle at X, and the action of the muscle as the arm is bent?

Aextensor; contracts
Bextensor; relaxes
Cflexor; contracts
Dflexor; relaxes

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