Question

Neurology questions

1- Under normal conditions, E_m :

1. Has a value that is closer to E_Na rather than
2. Has an average value between E_k and E_Na
3. Has a value that is closer to E_k rather than E_Na
4. Has a value over zero

Explain your answer:

2- If the extracellular concentration of potassium is tripled, the E_k :

1. Would turn less negative
2. Can’t be determined
3. Would not change
4. Would turn more negative

Explain your answer:

12 Which of the following is INCORRECT about the following table?

Experiment 1	Voltage (mV)	Time (ms)
Inflection point	-55	1.50
Peak	35	1.70
Undershoot	-80	2.70
Experiment 2
Inflection point	-53	0.50
Peak	35	0.80
Undershoot	-79.4	1.60

1. The data of experiment #2 suggest that an increase of the frequency for the generation of action potentials.
2. Represents data about the action potential
3. The data of experiment #1 shows the response to a normal stimulus
4. The data of experiment #2 shows the response to a stimulus with less intensity than the one on experiment #1

Explain your answer:

Answer 1

2.(a) would turn less negative

f the extracellular potassium concentration surrounding a myocyte increases, then the potassium gradient accross the cell membrane decreases, and therefore the resting membrane potential will become more positive.

3.(a) The data of experiment#2 suggest that an increase of the frequency for the generation of action potentials.