Joints are formed where two or more bones meet. We need joints that permit little to no movement in our skeletons to keep us upright. These joints are known as structural joints and are held together by fibrous connective tissue. Simply stated, if all our joints are able to move as our functional joints do, we will end up all floppy and jelly-like. We won't be able to keep our bodies upright or move as we currently do.
I think that health related professions are important in the society because they give there opinions to keep us healthy, and they also have backup plan when we are sick to try to make us better.
When your baby grunts, it usually means they're learning how to have a bowel movement. They haven't yet figured out how to relax the pelvic floor while also using abdominal pressure to move stool and gas through their system.