Exclusively breastfed babies do not require additional water even when it is very hot outside, as long as baby is allowed to nurse as needed. Even in extremely hot, dry weather your baby can get all the liquids needed via breastmilk.
Smooth muscles contract very slowly, whereas skeletal muscles can contract at different rates. Skeletal muscles can be composed of fast-contracting fibers, slow-contracting fibers or a mixture of both.
This is the structure of a skeletal muscle. Even though this is a zoomed in picture it still shows that skeletal muscles are much larger in size in comparison to cardiac and smooth. The structure of skeletal muscle tissue break down the process of how muscles contraction.