<u>Answer:</u>
Option (3)
The arms mostly contains old blue and blue-white stars
<u>Explanation:</u>
Spiral arms are the regions in stars extending from the middle of spiral galaxies and the barred spiral. Those long, thin areas look like a spiral and therefore give their name to spiral galaxies.
Spiral arms, though, include many young, blue stars, that render their arms so bright (due to the high mass density and the fast stellar forming rates).
The Myofilaments being used on a muscle contraction would return to their resting state when the sarcomeres would relax. The Sarcomeres are the individual contractile of the myofibrils which are then considered as the tiny rod like elements that are found within the muscle cells.
Answer:
Dissociation of the myosin head from the actin filament requires the binding of ATP (I).
