1. How does the sodium-potassium pump contribute to the resting potential of a neuron?
BIO HOMEWORK

Quiz
•
Biology
•
10th Grade
•
Hard
Hamdan Albloushi
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
A) It pumps Na+ into the neuron and K+ out
B) It pumps Na+ out and K+ in, maintaining a negative charge inside
C) It allows passive diffusion of ions
D) It only functions during an action potential
2.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
2. Why is the inside of a neuron negatively charged at rest?
A) There are more negatively charged ions inside than outside
B) The sodium-potassium pump removes more positive ions than it brings in
C) Large negatively charged proteins remain inside the cell
D) All of the above
3.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
3. What is the typical resting membrane potential of a neuron?
A) +30 mV
B) 0 mV
C) -70 mV
D) -55 mV
4.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
4. What triggers depolarization in a neuron?
A) The opening of voltage-gated sodium (Na+) channels
B) The closing of potassium (K+) channels
C) The release of neurotransmitters
D) The activity of the sodium-potassium pump
5.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
5. What happens during repolarization?
A) Sodium channels open, and Na+ enters the cell
B) Potassium channels open, allowing K+ to leave the cell
C) The neuron becomes more positive inside
D) The neuron reaches the threshold potential
6.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
6. What is the threshold potential?
A) The voltage at which an action potential is triggered
B) The maximum voltage a neuron can reach
C) The voltage at which neurotransmitters are released
D) The resting membrane potential
Answer explanation
(Usually around -55 mV.)
7.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
7. What occurs at the synaptic cleft during chemical synaptic transmission?
A) Electrical signals jump across the gap
B) Neurotransmitters are released and bind to receptors on the postsynaptic neuron
C) Ions flow directly between neurons through gap junctions
D) The action potential stops before reaching the cleft
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