The integumentary system covers and protects the muscular system. If we didn't have this protection, the muscles would be damaged be the external environment to the point of not being able to...
when you see the opposite sex (for Men) naked and you get a boner that's your nervous system and the reason you have a bonner because of the skin on your penis. that's how they work together.
The integumentary system serves as the first line of defense of the immune system by protecting the body's internal structures from any harmful bacteria or other harmful microbes in the environment....