Neuro 6

Question 1

neurotransmitters are released from…

Answer 1

vesicles

Question 2

large neurotransmitters are produced and packaged into vesicles at the ……

Answer 2

soma and transported (fast axonal)

Question 3

small neurotransmitters are synthesized and packaged at….

Answer 3

the axon terminal (synthesized enzymes brought to terminal via slow axonal)

Question 4

how are neurotransmitters released?

Answer 4

via Ca2+ mediated exocytosis

Question 5

Pre-synaptic terminals contain…

Answer 5

a high conc. of voltage-gated Ca2+ channels

Question 6

3 ways to inactivate neurotransmitters

Answer 6

• they return to axon terminals for reuse or transported into glial cells
• inactivated by enzymes
• they diffuse out of synaptic cleft

Question 7

stronger stimuli mean…

Answer 7

more neurotransmitters

Question 8

convergence

Answer 8

many presynaptic neurons converging to one or a small number of postsynaptic neurons

Question 9

divergence

Answer 9

neurons branching and contact many different postsynaptic neurons

Question 10

spatial summation

Answer 10

when currents from nearly simultaneous graded potentials of multiple neurons combine

Question 11

Spatial summation can be….

Answer 11

excitatory and inhibitory

Question 12

temporal summation

Answer 12

when two graded potentials from one presynaptic neuron occur close together

Question 13

axo-axonic synapse

Answer 13

augment communication between pre and postsynaptic cell

Question 14

presynaptic inhibition

Answer 14

inhibits neurotransmitter release

Question 15

presynaptic facilitation

Answer 15

increases neurotransmitter release

Question 16

Synaptic activity can be altered by…

Answer 16

changing the target cell’s responsiveness to neurotransmitters