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What are the functions of the PNS?
- 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
What is the CNS?
- 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
What are the functions of the spinal cord?
- Receives sensory information from the PNS and transmits it to the brain
- Transmits motor messages from the brain to the PNS
Describe the Somatic nervous system
- 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
Describe the Autonomic nervous system
- Regulates internal bodily functions
- Controls involuntary activity of internal, muscles and organs
What is the role of the sympathetic nervous system?
- Automatically arouses and energises the body during times of stress or need for increased physical activity
- Triggers fight-flight response
What is the role of the parasympathetic nervous system?
- 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)
Responses due to the fight or flight response
- High levels of adrenaline
- Increased heart rate and blood pressure
- Increased respiration rate
- Inhibited digestion
- Dilated pupils
- Dry mouth
- Relaxed bladder
What is the fight of flight response?
A state of arousal that prepares or mobilises the body to confront a situation (fight) or flee from the situation (flight)