Question

Filaments of actin and myosinproteins also involved in muscle cell contraction

Answer 1

Answer:

yes , the are involved in muscle contraction...

Explanation:

basically they are involved in bridge formation which helps in contraction..

Answer 2

The binding of ATP dissociates myosin from actin. The increased Ca2+ concentration signals muscle contraction via the action of two accessory proteins bound to the actin filaments: tropomyosin and troponin (Figure 11.25). Tropomyosin is a fibrous protein that binds lengthwise along the groove of actin filaments.