A: Unfortunately, many long-term effects of medications are not known since many medications are not studied for over 6 to 12 months. Adderall (amphetamine/dextroamphetamine) is a medication that has been used for many years in the treatment of ADHD and narcolepsy.
Answer by Nicole Cooper. Confidence votes 32. The role ATP plays in muscle contraction is that ATP binds to sites on myosin heads, inducing a conformational change in the actin binding site and reducing the affinity for the actin substrate. Hydrolysis of ATP then cocks the myosin head and moves it closer to the z disk.
Now, the mechanism of the Sliding Filament Theory can be explained. Muscle contraction involves four major steps (shown in Figure 2): ATP binds to the myosin head. The cross bridge between the two fibers breaks as the myosin head dissociates from the actin myofilament.