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PNB 2XB3 FULL Study Guide Questions and Answers | Latest Update 2024/2025 £9.41   Add to cart

Exam (elaborations)

PNB 2XB3 FULL Study Guide Questions and Answers | Latest Update 2024/2025

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  • Module
  • PNB 2XB3
  • Institution
  • PNB 2XB3

A-alpha conduction velocity? ~~> 80-120 m/s A-beta conduction velocity? ~~> 35-75 m/s A-delta conduction velocity? ~~> 5-30 m/s C-fibers conduction velocity? ~~> 0.5-2 m/s A-alpha axon diameter? ~~> 13-20 microns A-beta axon diameter? ~~> 6-12 microns A-delta axo...

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  • September 20, 2024
  • 26
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • PNB 2XB3
  • PNB 2XB3
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1 | P a g e | © copyright 2024/2025 | Grade A+


PNB 2XB3 FULL Study Guide Questions
and Answers | Latest Update
2024/2025
A-alpha conduction velocity?

✓ ~~> 80-120 m/s



A-beta conduction velocity?

✓ ~~> 35-75 m/s



A-delta conduction velocity?

✓ ~~> 5-30 m/s



C-fibers conduction velocity?

✓ ~~> 0.5-2 m/s



A-alpha axon diameter?

✓ ~~> 13-20 microns



A-beta axon diameter?

✓ ~~> 6-12 microns



A-delta axon diameter?




Master01 | September, 2024/2025 | Latest update

, 2 | P a g e | © copyright 2024/2025 | Grade A+

✓ ~~> 1-5 microns



C-fibers axon diameter?

✓ ~~> 0.2-1.5 microns



Synaptic cleft width?

✓ ~~> 20-40 microns



Number of neurons in the human brain

✓ ~~> 100 billion neurons



How much of our brain do we use

✓ ~~> 100%



How much power does our brain produce

✓ ~~> 20 W, similar to dim light bulb



How much percentage of power does our brain use

✓ ~~> 20%



CNS

✓ ~~> Central Nervous System:

Brain and spinal cord of vertebrates



Master01 | September, 2024/2025 | Latest update

, 3 | P a g e | © copyright 2024/2025 | Grade A+




PNS

✓ ~~> Peripheral Nervous System: All nerves and neurons that lie outside

of the spinal cord and brain



CSF

✓ ~~> Cerebral Spinal Fluid:

Clear and free fluid that fills ventricular system of central nervous system (salt-

water)



TTX

✓ ~~> Tetrodotoxin:

Found in pufferfish, irreversibly blocks sodium gated channels



AHP

✓ ~~> Afterhyperpolarization:

When the cell overshoots the resting membrane due to the high permeability

to potassium as both leak and ion gated channels are open



EPSP

✓ ~~> Excitatory Postsynaptic Potential:

Causes dendrite to depolarize, due to sodium moving into the cell, does

cause firing of action potential on postsynaptic cell



Master01 | September, 2024/2025 | Latest update

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