Unit 3: anatomy and physiology
作者：najat fayed
1. human body systems
1.1. musculoskeletal system
1.1.1. movement
1.1.2. support
1.1.3. protection
1.2. circulatory system
1.2.1. transport blood to the whole body
1.3. respiratory system
1.3.1. exchange oxygen and carbon dioxide
1.3.2. inhale
1.3.3. exhale
1.4. nervous system
1.4.1. controls the body and transports signals
1.4.2. Central nervous system
1.4.2.1. brain
1.4.2.2. spinal cord
1.4.3. Peripheral nervous ssytem
1.4.3.1. nerves
1.5. digestive ssytem
1.5.1. digests food into nutrients (energy)
1.6. immune system
1.6.1. Protects the body against pathogens