Week Two

Question 1

The function of the sodium/potassium pump is…

Answer 1

Continuously exchanges three intracellular Na+ for two K+

Question 2

During the action potential the…

Answer 2

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

Question 3

The “nerve impulse” describes the..

Answer 3

The movement of an action potential along the axon.

Question 4

Dendrites receive both..

Answer 4

Excitatory and inhibitory input

Question 5

Stimulation producing two EPSP’s in quick succession illustrates

Answer 5

Temporal summation

Question 6

A thickened appearance and receptor proteins are characteristic of the..

Answer 6

Post synaptic membrane

Question 7

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

Answer 7

influx of Ca++ ions in response to the arrival of an action potential at the terminal butoun.

Question 8

Neurotransmitters are produced in the…..

Answer 8

Soma and Golgi body.

Question 9

The correct order for a presynaptic event is….

Answer 9

The action tigon potential reaches the axon terminal, the calcium ion channels open, exocytosis then diffusion of the neurotransmitter

Question 10

Acetylcholine is the classical neurotransmitter for…..a

Answer 10

All skeletal motor synapses.

Question 11

Sympathetic neurons are both….

Answer 11

Cholinergic and adrenergic

Question 12

Parasympathetic neurons are….

Answer 12

Choline rigid

Question 13

GABA is responsible for

Answer 13

Decreasing the firing of cells, it is an inhibitor

Question 14

Neurotransmitter molecules are secreted from…. In response too

Answer 14

At the arrival of an axon potential neurotransmitter molecules are secreted from the axon terminal.

Question 15

Support for the myelination of axons in the peripheral nervous system is done by the ….

Answer 15

Schwann cells

Question 16

The membrane potential is defined as..

Answer 16

The difference in the electrical charge between the inside and the outside of the axon membrane

Question 17

The process by which similarly charged particles repel each other and are then distributed throughout a medium is called

Answer 17

Electrostatic pressure

Question 18

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

Answer 18

Potassium ions move out of the cell

Question 19

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

Answer 19

Is produced whenever the membrane potential reaches threshold.

Question 20

What is an advantage of myelination….

Answer 20

myelination reduces CEOs talk between adjacent neurons

Question 21

Axon membrane potential reduced from -70 to -65 is termed….

Answer 21

Depolarisation

Question 22

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

Answer 22

Action potential.

Question 23

The functions of a neuron are

Answer 23

Encoding memories, the production of thoughts and memories and the production of neurotransmitters.