Wk5- The Peripheral Nervous System Flashcards

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1
Q

What are 3 key roles of the PNS?

A
  1. Links CNS to organs and limbs
  2. Transmits sensory information to CNS
  3. Carries motor commands from CNS to PNS muscles and tissues
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2
Q

What are the 2 divisions within the PNS?

A
  1. Sensory / Afferent
  2. Motor / efferent
    (SAME)
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3
Q

Sensory / Afferent Division PNS
* Detects stimuli and transmits information to CNS
What are the 2 subdivisions

A
  1. Somatic: skin and musculoskeletal system

2. Visceral: internal organs

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4
Q

Motor / Efferent division of PNS
* Motor neurons convey motor instructions to different parts of the body.
What are the voluntary/ involuntary sub divisions?

A
  1. Somatic : voluntary motor functions activate skeletal muscles
  2. Visceral : Autonomic nervous system (ANS)
    Involuntary functions
    *sympathetic (fight/flight)
    *parasympathetic (rest/digest)
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5
Q

Sensory receptors have different types of nerve endings. What are the 2 types?

A
  1. Free nerve ending : no specialised structure

2. Encapsulated nerve ending : enclosed special structure - highly sensitive for specificity

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6
Q
There are 8 classes of sensory receptors.
1.exteroceptors
2.interoceptors
3.proprioceptors
4.mechanoreceptor
5.thermoreceptors
6.nociceptors
7.photoreceptors
8.chemoreceptors
What are their locations / functions?
A
  1. Exteroceptors (external surface of body)
  2. Interoceptors (internal inside vessels/organs)
  3. proprioceptors (inside muscles/ joints tendons for articulation body positioning)
  4. mechanoreceptors (touch/pressure/vibration)
  5. thermoreceptors (temperature up/down)
  6. nociceptors (pain- physical/ chemical damage/pain)
  7. photoreceptors (detect light/vision)
  8. chemoreceptors (detect chemicals- taste/smell)
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7
Q

The Autonomic Nervous System is the body’s auto pilot.

The ANS maintains homeostatic conditions in physiological systems. What are the 2 sub divisions?

A
  1. Sympathetic (fight/flight)

2. parasympathetic (rest/digest)

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8
Q

The ANS Sympathetic sub division ;

  • rapidly prepares the body for s-/e-?
  • promotes a-?
  • uses 2 neurotransmitters A- and N-?
  • Adrenaline /E- ?are released into the bloodstream
A
  1. Stress and exertion
  2. Alertness
  3. Acetylcholine ; norepinephrine
  4. Epinephrine
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9
Q

The ANS parasympathetic subdivision is responsible for normal body functions.

  • promotes relaxation and r-?
  • has much s- reactions
  • uses 1 neurotransmitter A-?
A
  1. Rest
  2. Slower
  3. Acetylcholine
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10
Q

Effects of sympathetic division:

Vaso? in heart and skeletal muscle
D? of pupils
Increased heart ? and force of contraction
Inhibition of ? system
Increase in blood glucose and fatty acids
D? of bronchial tubes
Inhibition of ? secretion
Activation of hair follicle pili muscles = ?bumps
Increase blood tendency to clot

A
Vasodilation 
Dilation 
Rate 
Gastrointestinal 
Dilation 
Saliva 
Goose bumps
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11
Q

Effects of parasympathetic division:

Decrease of heart ? and force of contraction 
? of pupils 
Stimulation of ? system function 
? of bronchial tubes 
Increase in ? secretion 
Promotion of glycogen synthesis
A
Rate 
Constriction 
Gastrointestinal 
Constriction 
Saliva
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