There are many acceptable explanations as to the difference between anatomy and
physiology.
The more commonly used ones are:

• Anatomy involves the study of how the various cells in the body are arranged, while
  physiology involves the study of how cells and tissues actually function.
• Anatomy deals with structure, and physiology deals with function.
• Anatomy is the study of where things in the body are located, while physiology is the
  study of how things in the bodywork.
• Anatomy is the study of the parts of the body themselves, while physiology is the study
  of how they work and interact with each other.
• Anatomy describes and names the parts of the body, while physiology describes how
  these parts function.