Deck 26: Cells Synapses and Neurotransmitters

Question 1

Which of the following is NOT a function of astrocytes?

A) M akin g m yelin
B) Taking up K+ from the ISF
C) Ph ag oc ytos ing ce llula r de br is
D) Helping to tighten endothelial cell junctions
E) Taking up neurotransmitters like GABA

Answer 1

A

Question 2

The cell type that mak es myelin in the central nervous system is the

A) As trocyte
B) Olig od en dro glia
C) Ep en dym al c ell
D) Sc hw an n c ell
E) M icr og lial c ell

Answer 2

B

Question 3

Fast axonal transport moves m aterials down the axon about

A) 0.1 mm per day
B) 1-2 mm /day
C) 10-20 mm /day
D) 200-400 mm/day
E) 2-3 m/day

Answer 3

D

Question 4

Fusion of small synaptic vesicles with the pre-synaptic mem brane requires

A) tub ulin
B) kin es in
C) cla thr in
D) dyn am in
E) Ca₂+

Question 5

Usually, action potentials in neurons begin at the

A) Axon hillock
B) First node of Ranvier
C) Larg est d end rite
D) S oma
E) Sm allest d end rite

Question 6

Neuronal information comes to the neuron through

A) Axo-dendritic synapses
B) Axo-somatic synapses
C) Axo-axonal synapses
D) Dendro-denritic synapses
E) All of the above

Question 7

Fusion of synaptic vesicles is stopped by

A) Reduction in [Ca₂+] within the nerve terminus
B) Depletion of the pool of readily releasable neurotransmitter
C) Recycling of synaptic vesicles
D) Ca₂+ bin din g to syn ap tota gm in
E) Ca₂+ entry through voltage-dependent Ca₂+ ch an ne ls

Question 8

A major function of oligodendroglia cells is to

A) Make m yelin in the central nervous system
B) Make CSF
C) Form a scaffold for neuron organization
D) Ph ag oc ytos e c ellu lar de br is
E) Take up K +

Question 9

An example of an ionotropic receptor is the

A) M1 cholinergic receptor
B) D1 dopaminergic receptor
C) M2 c holinergic receptor
D) Nico tinic ch olinerg ic recep tor
E) Both A and C

Question 10

Axonal transport of synaptic vesicles involves

A) Ve sicles bou nd to interm edia te filam ents
B) Vesicles moving along microtubule tracks
C) Vesicles moving by bulk flow of axoplasm
D) Passive transport mechanisms
E) M ag ic

Question 11

Gaps in the myelin sheath in the peripheral nervous system are called

A) Sc hw an n c ells
B) Clefts of Lenterman
C) Nodes of Ranvier
D) Saltatory junctions
E) Connexons

Question 12

Slow axonal transport moves m aterials down the axon about

A) 0.1 mm per day
B) 1-2 mm/day
C) 10-20 mm /day
D) 200-400 mm /day
E) 2-3 m/day

Question 13

Norepinephrine is synthesized from

A) Tryptophan
B) AMPA
C) NMDA
D) GABA
E) Tyrosine

Question 14

Which of the following is characteristic of large dense core synaptic vesicles?

A) T he y co nta in n eu ro tra ns m itter s m ad e a t the ne rve ter m ina l.
B) Their contents are clear in electron micrographs
C) They are about 50 nm in diameter
D) They fuse with the presynaptic mem brane less than 1 ms after an action potential
E) They are generally more than 300 nm away from a Ca₂+ cha nn el

Question 15

Which of the following is characteristic of small synaptic vesicles?

A) They contain neurotransmitters made only in the soma.
B) Their contents show as a dense core in electron micrographs.
C) The y are about 100-300 nm in diameter.
D) They fuse with the presynaptic membrane less than 1 ms after an action potential.
E) They are generally more than 50 nm away from a Ca₂+ ch an ne l.