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Peripheral Nervous System (PNS), image, image, image - Coggle Diagram
Peripheral Nervous System (PNS)
Autonomic Nervous System
perform this two opposite functions in order to maintain internal balance
Sympathetic
Flight or fight response system
Causes general alertness and excitement
Body's way of responding to a perceived threat
Parasympathetic
Rest & digest response system
Restores the body to a calm/restful state
Definition: One of two components of nervous system contains all nerves that lie outside Central Nervous System (CNS)
Structure of PNS
31 pairs of nerves branching from spinal cord (spinal nerves)
12 pairs emerge from brain (cranial nerves)
Total of 43 nerve pairs
Considered separate from brain & spinal cord
Form a basis of PNS
The reflex arc
Has 5 components receptors, sensory neurons, interneurons, motor neurons, effectors
Gangalia
-act as relay stations one nerve enter and one nerve exits
Motor Nerves & Sensory Nerves :explode:
Sensory Neurons (Afferent)
To detect various sensations such as pain and heat
Receive and transmit message from all parts of body towards the CNS to be interpreted by either spinal cord or the brain
Motor Neurons (Efferent)
To transmit messages away from the CNS
Stimulate effectors (skin, sense organs, muscles) to perform a function or reflex
Voluntary & involuntary responses
Somatic Nervous system
-controls voluntary responses
responsible for relaying sensory & motor information between outside enviroment and CNS
Innervate outer sections of body (skin & skeletal muscles)
Use in any muscle movement or voluntary motor output
Autonomic Nervvous System
-controls involuntary movement in body
Innervates our internal organs
Controls vital functions
heart rate
respiration & breathing
digestion
