
Bio 251 Study Guide Questions 13-20
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Biology
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University
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Breyonah Owens
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following events initiates an action potential?
Voltage-gated potassium channels open, causing the membrane to hyperpolarize.
A graded potential reaches the axon hillock and triggers the opening of voltage-gated sodium channels.
The inactivation of sodium channels leads to membrane depolarization.
Ligand-gated ion channels open, allowing calcium ions to enter.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which ion is primarily responsible for depolarization during an action potential?
Potassium (K⁺)
Calcium (Ca²⁺)
Sodium (Na⁺)
Chloride (Cl⁻)
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What occurs during repolarization of the neuron’s membrane?
Sodium channels open, causing the membrane to become more positive.
Potassium ions leave the neuron, making the inside of the cell more negative.
The neuron reaches a more positive potential, exceeding +30 mV.
Both sodium and potassium channels close simultaneously.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
During which phase of the action potential is the membrane most permeable to potassium?
Depolarization
Resting potential
Repolarization
Hyperpolarization
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following best describes hyperpolarization?
The inside of the neuron becomes more negative than its resting potential.
The membrane potential becomes more positive than the resting potential.
Sodium ions rush into the cell, making the membrane potential more positive.
Potassium ions enter the cell, causing the membrane potential to exceed zero.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the function of voltage-gated sodium channels during an action potential?
They allow potassium ions to enter the cell, initiating hyperpolarization.
They open in response to membrane depolarization, allowing sodium to flow in.
They close once the action potential reaches its peak, triggering repolarization.
They regulate neurotransmitter release at the axon terminal.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the significance of the absolute refractory period?
It prevents the action potential from reversing direction along the axon.
It allows the neuron to generate another action potential immediately.
It increases the strength of graded potentials, allowing summation.
It ensures the action potential will travel faster along myelinated axons.
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