Muscular System
저자: mercedes zuniga
1. types of muscles
1.1. skelital
1.2. smooth
1.2.1. lines organs
1.3. cardiac
1.3.1. found in heart
2. movement
2.1. voulantary
2.1.1. under your control
2.2. invoulantary
2.2.1. not directly under your control
2.3. movement- brain sends a signal for the muscle to contract(short)
2.3.1. work in pairs