The Peripheral Nervous System
- Created by: 0045253
- Created on: 31-05-22 12:40
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- The Peripheral Nervous System
- The PNS transmits messages, via millions of neurons to and from the CNS
- Somatic nervous system
- responsible for controlling muscle movement and receiving information from sensory receptors
- involved in reflex actions without the involvement of the CNS, which allows the reflex to occur very quickly
- The SNS carries commands from the motor cortex
- Autonomic nervous system
- governs the brain’s involuntary activities and is self-regulating
- Controls vital functions in the body such as breathing, heart rate, digestion, sexual arousal and stress responses
- The ANS control centres are in the brain stem
- Parasympathstic branch
- relaxes the body. Known as the ‘rest and digest’ response
- Sympathetic branch
- arouses the body. Known as the ‘fight or flight’ response
- somatic nervous system and the autonomic nervous system both contain sensory and motor nerves
- Sensory (afferent) nerves transmit impulses from peripheral organs to the CNS.
- Motor (efferent) nerves transmit impulses from the CNS out to the peripheral organs to cause an effect or action.
- Difference between ANS and SNS
- ANS: Involuntary, Controls muscles, internal organs and glands of the body, Control centres are in the brain stem.
- SNS: Voluntary, Controls skeletal muscles and movement Controls skeletal muscles and movement, Carries commands from the motor cortex.
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