The answer is the digestive and circulatory system.
Answer:
D
Explanation:
myosin heads form cross bridges and pull thin filaments causing them to slide.
the presence of acetocholene causes calcium to be released causing depolarization of the sarcoplasmic reticulum and changing its shape. the myofilaments together with actin allows the myosin to form cross bridges along the muscle fibers and releases ATP for movement of the muscle.
Keep exercising regularly and doing good things to your body then you wont have to worry about dammaging your body
Answer:
I belive it is C., im pretty confedint
Explanation:
A, Personal Values. Never do anything that may feel wrong to you, it's not worth it.