Antagonistic muscles

Muscles work in opposing pairs to move bones in opposite directions. They can only pull, not push, so they are arranged in pairs to exert power both ways. Extensor muscles, like the triceps, open joints, while flexor muscles, like the biceps, close them.

What is the role of opposing pairs of muscles in the movement of bones?

Explain why muscles can only pull and not push.

How are muscles arranged to allow power to be exerted in both directions?

Describe the function of extensor and flexor muscles with examples.

What happens to a joint when the triceps and biceps contract?