Músculos antagonistas

Muscles can only pull, not push, and are often arranged in pairs to allow movement in both directions. Extensor muscles, like the triceps, open joints, while flexor muscles, like the biceps, close them.

What is the primary function of muscles in relation to bones?

How are muscles arranged to allow movement in both directions?

What role does an extensor muscle play in joint movement?

Can you explain the difference between an extensor and a flexor muscle?

What happens to a joint when a flexor muscle contracts?