Quiz 2

Question 1

Na+ and K+ are examples of what?

Answer 1

Cations

Question 2

Movement of one Cl- ion is equivalent to the movement of what?

Answer 2

One electron

Question 3

Prior to the arrival of neurotransmitter, which of the following is the most powerful diffusion force?
-Sodium wants to flow out of the cell
-Potassium wants to flow into the cell
-Sodium wants to flow into the cell
-Potassium wants to flow out of the cell

Answer 3

Sodium want to flow into the cell

Question 4

What is chloride’s situation prior to he arrival of the action potential?

Answer 4

It wants to flow into the cell against its electrical gradient

Question 5

Why is the concentration of Ca++ inside the cytsol of the cell so low?

Answer 5

It is sequestered inside the smooth endoplasmic reticulum

Question 6

What causes the gated ion channels to open to begin the EPSP?

Answer 6

Excitatory neurotransmitter

Question 7

The ease with which an ion can cause through the neuronal membrane is called what?

Answer 7

Permeability

Question 8

The Na+-K+-ATPase pump does what?

Answer 8

Pumps 3 Na+ ions out of the cell and two K+ ions in

Question 9

What is the physiological event that underlies an Inhibitory Post-Synaptic Potential (IPSP)?

Answer 9

Flow of Cl- ions into the neuron

Question 10

Prior to the EPSP, K+ ions want to flow out from the neuron due to their concentration gradient, but are forced to stay in the negatively-charged neuron due to its electrical gradient. After an EPSP that brings the charge in the neuron to +30 mV, what is the status of the K+ gradients?

Answer 10

They want to flow out of the neuron due to their concentration and electrical gradients

Question 11

How does myelin help with propagation of the action potential down the axon?

Answer 11

It prevents leakage of positive ions from the axon and forces the positive charge down the length of the axon