Neurophysiology

Question 1

What is the Gibbs-Donnan Equilibrium?

Answer 1

in the presence of a nondiffusible ion, diffusible ions distribute themselves so that at equilibrium their concentrations are equal

Question 2

Function of Type A α fibers

Answer 2

proprioception, somatic motor

Question 3

Function of Type A β fibers

Answer 3

touch, pressure

Question 4

Function of Type A γ fibers

Answer 4

motor to muscle spindles

Question 5

Function of Type Aδ fibers

Answer 5

pain, cold, touch

Question 6

Function of Type B fibers

Answer 6

preganglionic autonomic

Question 7

Function of Type C dorsal root fibers

Answer 7

pain, temperature, some mechanoreception, reflex response

Question 8

Function of Type C sympathetic

Answer 8

postganglionic sympathetics

Question 9

Identify the structures that each wave in BAER represent

Answer 9

I acoustic nerve
II cochlear nuclei
III superior olives
IV lateral lemniscus tracts and nuclei
V inferior colliculi

VI medial geniculate body
VII auditory cortex

Question 10

α-bungarotoxin

Answer 10

peptide, a snake venom, binds irreversibly to nicotinic AChR

Question 11

BotulinumToxin

Answer 11

prevents AChrelease

Question 12

Venom of black widow

Answer 12

stimulates Ach release

Question 13

Atropine

Answer 13

muscarinic blocker

Question 14

5 Criteria defining a neurotransmitter

Answer 14

1 synthesis of the NT in the neuron
2 storage of the NT or its precursor in the presynaptic neuron
3 release of NT into the synaptic cleft to bind to receptors causing change in the postsynaptic neuron
4 mechanism of removal of NT from the synaptic cleft
5 exogenous application of the NTresults in the same effects as endogenously released NT