Chpt. 17: Nervous System (ANS)

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Last updated 6:42 AM on 8/8/26
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6 Terms

1
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what kind of signal does the autonomic NS carry?

visceral motor signal

2
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what does it mean for the ANS to have an “antagonistic nature”

not on/off switch, intensity/activity dial going up or down

3
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what are the two branches of the ANS

1) sympathetic NS
2) parasympathetic NS

4
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physical bodily reaction from each branch

  • SNS: increase HR, eyes + lungs dilate

  • PNS: decrease HR, eyes + lungs constrict

5
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difference between SNS + PNS

1) location + length of pre-ganglionic neuron

  • SNS: shorter, farther, thoracolumbar

  • PNS: longer, closer, craniosacral, myelinated

2) location + length of post-ganglionic neuron

  • SNS: longer, sympathetic trunk

  • PNS: shorter,

3) neurotransmitters of pre-/post- ganglionic neuron

  • SNS: acetylcholine, norepinephrine

  • PNS: acetylcholine, acetylcholine

6
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function of white/gray ramus communicans

  • white: allows passage of sympathetic pre-ganglionic axons into the sympathetic trunk

  • gray: carries post-ganglionic sympathetic fibers back to spinal nerves