Revision - 2

Question 1

What is not part of the neuron’s function?

Answer 1

The production of myelin

Question 2

The sodium/potassium pump …

Answer 2

Continuously exchanges three intracellular Na+ for two K+

Question 3

During an action potential …

Answer 3

The voltage of the cell membrane goes to about +30mV and then drops to -80mV before returning to -70mV

Question 4

Nerve “impulse” describes …

Answer 4

The movement of an action potential along the axon

Question 5

Dendrites can receive …

Answer 5

Both excitatory AND inhibitory input

Question 6

Stimulation producing two ESPs in quick succession illustrates …

Answer 6

Temporal summation

Question 7

Which of the following are characteristic of the postsynaptic membrane?

Answer 7

Thickened appearance and receptor proteins

Question 8

A key event in the release of neurotransmitter molecules into the synaptic cleft is the …

Answer 8

Influx of Ca++ ions i n response to the arrival of an action potential at the button (bouton)

Question 9

Neurotransmitters are produced in the …

Answer 9

Soma and synaptic terminals

Question 10

What element is not part of the amine subtype of small-molecule neurotransmitters?

Answer 10

Glycine

Question 11

The correct chronological order of presynaptic events:

Answer 11

1) Action potential reaches axon terminal
2) Calcium ion channel opens
3) Exocytosis
4) Diffusion of neurotransmitter

Question 12

Acetylcholine is the classical neurotransmitter for …

Answer 12

All skeletal motor synapses

Question 13

Sympathetic neurons are ___ while parasympathetic neurons are ___

Answer 13

Cholingeric AND adrenergic, ONLY cholinergic

Question 14

Gamma Amino Butyric Acid (GABA) …

Answer 14

Decreses the firing of cells

Question 15

A second messanger is …

Answer 15

A chemical in the postsynaptic cell that is activated by a G protein (after receptor stimulation)

Question 16

Neurotransmitter molecules are secreted from ___ in response to the arrival of an action potential

Answer 16

The axon terminal

Question 17

The ___ cells support myelination of axons in the peripheral nervous system

Answer 17

Golgi

Question 18

The ___ is defined as the difference in electrical charge between the inside and the outside of the axon membrane

Answer 18

Membrane potential

Question 19

The process by which similarly charged particles repel each other and are thus distributed throughout a medium, is termed:

Answer 19

Electrostatic pressure

Question 20

What event restores the membrane potential from the peak of the action potential back to the resting level?

Answer 20

Potassium ions move out of the cell

Question 21

The “all-or-none law” refers to the observation that an action potential …

Answer 21

is produced whenever the membrane potential reaches threshold

Question 22

What is suggested as an advantage associated with myelination?

Answer 22

Myelin prevents cross-talk between adjacent neurons

Question 23

What is true of receptors?

Answer 23

Neurotransmitters bind to and activate receptors to exert their effects

Question 24

An electrical charge applied to an axon that moves the membrane potential from -70mV to -45mV will result in an …

Answer 24

Action potential

Question 25

Movement of the axon membrane potential from -70mV to -65mV would be termed:

Answer 25

Depolarisation