a. How does the neuron re-establish its resting membrane potential after an action potential? -Sodium (Na+) gated channels close -Sodium (Na+) gated channels open -Potassium (K+) and sodium (Na+) gated channels close -Sodium/ potassium pumps (Na+/K+ pumps) exchange ions
Neurons
a. How does the neuron re-establish its resting membrane potential after an action potential?
-Sodium (Na+) gated channels close
-Sodium (Na+) gated channels open
-Potassium (K+) and sodium (Na+) gated channels close
-Sodium/ potassium pumps (Na+/K+ pumps) exchange ions
b.Which of the ion channels utilizes a passive transport system (in other words, do not require ATP)? Mark all that apply.
-K+ leak channels
-K+ channels (gates)
-Na+ leak channels
-Na+ channels (gates)
-Na+/K+ pumps
c.The absolute refractory period occurs when the neuron is undergoing the action potential and implies it cannot be further stimulated.
True or False
d. After an action potential, as the neuron repolarizes, the resting membrane potential is immediately re-established
True or False
e.Match the type of gate or process with its overall effect on the neuron
So Match each term with the best-fit description.
Terms:
Na+/K+ pump
K+ voltage gate
Resting membrane potential
Hyperpolarization
Na+ voltage gate
Descriptions:
Na+ leak channel
G-protein coupled receptor
During an action potential, this will cause the neuron to depolarize
The neuron is unstimulated and remains at roughly -70mV
K+ leak channel
The neuron's voltage is lower than -70mV and would require a greater stimulus to reach threshold
Pulls potassium back into the neuron and ejects sodium out of the neuron after the action potential was completed
During an action potential, this will cause the neuron to repolarize
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