The cell is the basic structure from which all other body structures are made . you will want to develop a comfortable knowledge about cell growth and metabolism . you will want a basic knowledge of each of the main systems of the body and of tissue. once gained information about how each organ or system functions and its purpose, you can be more effective in the services you provide. in your own words , how can an overall knowledge of anatomy and physiology be instrumental in you become an effective cosmetologist ?