Answer:
1. rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius.
2. cant see picc
3. biceps/ triceps?
4.to move bones in opposite directions, pairs of muscles must work in opposition.
5. bicep/ tricep
6. bicep contracts tricep relaxes
7.Both of the muscles need to be equally developed to maintain normal functions.
Explanation:
