Types of Muscle The human body is comprised of over 600 muscles Muscle makes up 30-35% (in women) and 42-47% (in men) of body mass. Three types of muscle:
The Muscular System
THE DIGESTIVE TRACT
Digestive tract Digestive tract Li Zhong Jie （李仲杰）, Ph. D School of Medicine,Zhejiang University.
Muscle Structure and Function
