1. All our functions are carried out by an effort of several systems working together.
2. For example, while movement, we hardly ever use just the muscular system or skeletal system alone.
3. Several other systems also have their own roles to play. Even within the muscular system, severed muscles work in a sequence.
4. It is a kind of pathway involving the way that our organs, tissues, and cells pick up signals of change from their surroundings and respond to them that triggers different functions in our body as well as by our body.
5. For example, the eyes, ears, legs should coordinate with each other, when crossing a street.