Explain how you use pairs of muscles to flex and extend you arm.

When you flex your arm your biceps contract, and your triceps extend. And when you unflex your arm the triceps contract and you biceps extend. The muscles work together to allow you to move your body

When you flex your arm your biceps contract, and your triceps extend. And when you unflex your arm the triceps contract and you biceps extend. The muscles work together to allow you to move your body

Anxiety disorders, attention deficit hyperactivity disorder (adhd, add), and autism spectrum disorder (asd). (source: )