Nervous System

Question 1

PNS controls:

Answer 1

Spinal and cranial nerves

Question 2

Sensory neurons

Answer 2

Info TO CNS

• goes to brain
• afferent

Question 3

Motor neurons

Answer 3

Info FROM CNS

• brain tells body
• efferent

Question 4

PNS spinal nerves:

Exit from?
How many?

Answer 4

Exit from spinal cord

31 pairs:
7 cervical
12 thoracic
7 lumbar
5 sacral

Question 5

PNS autonomic nervous system:

Operates w/o?
Has what fibers?

Answer 5

Conscious control

Has sensory and motor fibers

Question 6

CNS controls:

Answer 6

Brain and spinal cord

Question 7

PNS ANS divisions:

Answer 7

2 antagonistic divisions:
Sympathetic (fight or flight)
Parasympathetic (rest and digest)

*ANS is the caretaker of the body

Question 8

Sympathetic nervous system (SNS)

Physiologic changes:

Answer 8

Increased BP, increased HR
Pupil dilation
Decreased salivary
Decreased GI motility 
Bronchodilation

Question 9

SNS neurotransmitter

Answer 9

Norepinephrine

*fight or flight

Question 10

Parasympathetic nervous system (PNS)

Physiologic changes:

Answer 10

Decreased BP and HR
Pupil constriction 
Increased GI motility
Increased salivary secretion
Bronchoconstriction

Question 11

PNS neurotransmitter

Answer 11

Acetylcholine

*reparative response

Question 12

ANS regional differences:

Sympathetic vs parasympathetic

Answer 12

Sympathetic- arises from thoracic and lumbar regions of spinal cord

Parasympathetic- arises from sacral region and cranial nerves 3, 7, 9, 10