As in the interval between stimuli decreases, the depolarization needed to generate the second action
potential
a. increases
b. stays the same
c. decreases
d. There is never a second action potential - a. increases
What is the approximate concentration of K+ inside a typical cell (intracellul...
PhysioEx Exercise 3 Activity 1-6
Questions
As in the interval between stimuli decreases, the depolarization needed to generate the second action
potential
a. increases
b. stays the same
c. decreases
d. There is never a second action potential - a. increases
What is the approximate concentration of K+ inside a typical cell (intracellular concentration)?
a. 150 mM
b. 5 mM
c. 0 mM
d. 15 mM - 150 mM
What is the approximate concentration of K+ outside a typical cell (extracellular concentration)?
a. 150 mM
b. 5 mM
c. 0 mM
d. 15 mM - 5 mM
What is the approximate concentration of Na+ inside a typical cell (intracellular concentration)?
a. 150 mM
, b. 5 mM
c. 0 mM
d. 15 mM - 5 mM
A negative membrane potential was recorded when the tip of the microelectrode was
a. in the extracellular solution, just outside the cell body
b. just inside the cell body
c. just inside the axon
d. both inside the cell body and inside the axon - both inside the cell body and inside the axon
Which of the following caused a change in membrane potential from -70 to -40 in the cell body?
a. an increase in extracellular K+
b. a decrease in extracellular K+
c. an increase in extracellular Na+
d. a decrease in extracellular Na+ - an increase in extracellular K+
Which of the following has the most negative voltage?
a. between the outside of the axon and outside the cell body with control K+ ECF
b. between the outside of the axon and outside the cell body with High K+ ECF
c. between the inside of the axon and the outside of the axon with control K+ ECF
d. between the inside of he axon and the outside of the axon with the High K+ ECF - between the
inside of the axon and the outside of the axon with control K+
Assuming that the resting potential of a sensory neuron is -70 mV, which of the following represents a
depolarization?
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