Peripheral Nervous System Flashcards
What is the PNS
Nerves which link the CNS to the rest of the body
The Somatic System
voluntary control
carry info from sensory receptors to muscles
The Autonomic System
involuntary control
maintains homeostasis
Sympathetic subdivision
fight or flight
active during stressful situations
release epinephrine/norepinephrine
Parasympathetic Subdivision
rest and digest
active when body is calm and at rest
release of acetylcholine
What happens to the heart in sympa vs parasympa
Sym: increase heart rate
Para: decrease heart rate
What happens to the digestive tract in sympa vs parasympa
S: decrease peristalsis
P: increase peristalsis
What happens to the liver in sympa vs parasympa
S: increase glucose release (glycogen to glucose)
P: increase glucose storage (glucose to glycogen)
What happens to the eyes in sympa vs parasympa
S: pupils dilate
P: pupils constrict
What happens to the bladder in sympa vs parasympa
S: inhibits urinations
P: promotes urination
What happens to the skin in sympa vs parasympa
S: decrease blood flow
P: increase blood flow
What happens to the respiratory system in sympa vs parasympa
S: dilates bronchioles
P: constricts bronchioles
Why does sensation occur
by the stimulation of sensory receptors which create neural impulses
Sensory Adaptation
filters redundant stimuli to prevent overload
What are the four types of receptors
Photoreceptors- light
Chemoreceptors- chemicals
Mechanoreceptors- pressure
Thermoreceptor- heat/cold
