Nervous system

• To transmit sensory information from the body, organs and glands to the CNS
• To send motor messages from the spinal cord to appropriate body parts via motor neurons

• Consists of the brain and the spinal cord
• It receives and processes sensory information from internal and external environment and coordinates a response.
• Conveys messages to the body and vice versa through the PNS

• Receives sensory information from the PNS and transmits it to the brain
• Transmits motor messages from the brain to the PNS

• Controls voluntary movement via control of skeletal muscles
• Transmits sensory information inwards towards the spinal cord
• Transmits motor messages outwards from the spinal cord to appropriate body parts

• Regulates internal bodily functions
• Controls involuntary activity of internal, muscles and organs

• Automatically arouses and energises the body during times of stress or need for increased physical activity
• Triggers fight-flight response

• Calms the body and returns internal systems to calm levels of activity when stress or the need for physical activity disappears
• Responsible for maintaining the stability of normal bodily functioning (homeostasis)

• High levels of adrenaline
• Increased heart rate and blood pressure
• Increased respiration rate
• Sweating
• Goosebumps
• Inhibited digestion
• Dilated pupils
• Dry mouth
• Relaxed bladder

A state of arousal that prepares or mobilises the body to confront a situation (fight) or flee from the situation (flight)