What is the main function of muscles in the body?
To generate movement by contracting and relaxing to move the skeleton, organs and blood
What are antagonistic muscles?
They are muscles that work in the opposite way to create movement. An example is the biceps and triceps
When you bend your arm, which muscle contracts and which relaxes?
When you bend your arm, your biceps contract while your triceps relax.
What do muscles need from the blood to contract?
Muscles need oxygen to contract and relax