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.
However, their major difference is that the skeletal muscle is controlled by the somatic nervous system, and the cardiac muscles are, by nature, involuntarily controlled. Besides their overall different locations within the body, these two muscles also have many differences in their cellular structures..Unlike the skeletal muscles, there are gap junctions in the cardiac muscles, and their contractions function independently from each other. 6.There are only one or two nuclei in the cardiac muscle cells, while the skeletal muscle cells are multi-nucleated.