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Worksheets🧠 "Nerve Spark: Action Potential Quiz" ⚡
Total questions: 20
Worksheet time: 7mins
What is the resting membrane potential of a typical neuron?
+70 mV
-70 mV
0 mV
-30 mV
Which ion is primarily responsible for the depolarization phase of an action potential?
Potassium (K⁺)
Calcium (Ca²⁺)
Sodium (Na⁺)
Chloride (Cl⁻)
What term describes the minimum stimulus required to generate an action potential?
Limit stimulus
Threshold stimulus
Peak potential
Submaximal stimulus
During repolarization, which ion moves out of the neuron?
Na⁺
Ca²⁺
Cl⁻
K⁺
What happens if the membrane potential becomes more negative than the resting potential?
Depolarization
Hyperpolarization
Repolarization
Excitation
Which of the following best describes the "all-or-none" law of action potentials?
Weak stimuli cause weak responses.
Larger stimuli produce larger action potentials.
Once threshold is crossed, an action potential always occurs.
Action potential size depends on ion concentration.
What ensures that a second action potential cannot be generated immediately after the first one?
Low Neuron battery
Refractory period
Continuous conduction
Ion channels get bored
Which of the following speeds up nerve conduction?
Unmyelinated axons
Thin axons
Continuous conduction
Saltatory conduction
At rest, which ion is in higher concentration inside the neuron?
Na⁺
K⁺
Ca²⁺
Cl⁻
What causes the membrane potential to return to negative after depolarization?
Na⁺ exits the cell
K⁺ enters the cell
K⁺ exits the cell
Na+ enters the cell
Which part of the neuron generates the action potential?
Dendrite
Axon hillock
Axon terminal
Soma
"Sodium party inside, potassium rushes out later" — this describes:
Resting phase
Depolarization and repolarization
Hyperpolarization
All of the Above
What is the main purpose of an action potential in a motor neuron?
To generate heat
To send pain signals
To transmit signals to muscle fibers for contraction
To increase blood flow
Which of the following will slow down the conduction of a nerve impulse?
High temperature
Large diameter axon
Demyelination of axon
Presence of voltage-gated channels
What is summation in relation to muscle contraction?
Relaxation of a muscle after a single stimulus
Addition of multiple stimuli to produce a stronger contraction
Generation of action potential in sensory neurons
Inhibition of motor neurons during rest
What is the resting membrane potential (RMP) of a typical skeletal muscle fiber?
–90 mV
–70 mV
–55 mV
+30 mV
During the absolute refractory period, a neuron:
Can fire again if the stimulus is very strong
Cannot fire another action potential at all
Is slowly returning to its resting state
Is depolarized but still excitable
What distinguishes the relative refractory period from the absolute refractory period?
No channels are open
Sodium channels are still inactivated
A stronger-than-normal stimulus is required to initiate another action potential
The neuron is completely unresponsive
Which of the following best describes an action potential?
A steady flow of ions maintaining the resting state
A brief electrical signal that travels along a neuron or muscle fiber
A mechanical signal that stimulates blood flow
A chemical change that happens only in the synapse
Why does a nerve sometimes not fire when a stimulation is continuous ?
The nerve is damaged
It is in the refractory period
It has adapted through accommodation
The ions have stopped moving
