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.
Smooth Muscles vs Skeletal Muscles. The human body is made up of biological systems that include organs and tissues which include muscles. A muscle is a tissue that comes from the mesodermal layer of germ cells. It contains filaments that contract and change the size of cells as they move past each other.