If you get a career in any medical field then it's important to know about the functions of the body systems. Knowing about how they work will prepare you for what you need to know when you get that job. Learning these things in school helps prevent you from struggling with your career.
Black rotten old never smoke
A.Showing Aggression because if u show arrgrisiveness then you will/would end up starting a fight which is a negative way of dealing with it. Hope it helps mate