Mod. 3

Question 1

Which of the following ions are greater inside the cell?

Answer 1

K+

Question 2

Which of. the following are true regarding a neuron’s resting potential?

Answer 2

1. It’s around -60 mv
2. It’s an electrical difference across the membrane
3. It’s negative because the cell’s interior is more negative than the outside.

Question 3

Across the cell membrane, there is an electrical gradient. What does that mean?

Answer 3

There is a different overall charge inside the cell vs. outside

Question 4

Molecules tend to move against their concentration gradient.

Answer 4

False

Question 5

When neurotransmitters bind to the receptors on a neuron and the axon hillock depolarizes to its threshold, what channels open to further depolarize the cell?

Answer 5

Voltage-gated Na+ channels

Question 6

During an action potential, when K+ rushes out of the cell, there is an overshoot and the cell becomes what?

Answer 6

Hyperpolarized

Question 7

When action potentials are propagated along an axon with saltatory conduction, action potentials are regenerated at each what?

Answer 7

Node of Ranvier

Question 8

After an action potential reaches the axon terminal, which channels open to allow ions that trigger the release of neurotransmitters into the synaptic cleft.

Answer 8

Ca2+

Question 9

Which of the following is true regarding inhibitory postsynaptic potentials?

Answer 9

Lowers the presynaptic membrane potential further away from threshold.