Cumulative level test: Cells to behavior

Check understanding, separately from reading

10 questions · 80% to pass · no timer. This longer test revisits both units in the level. These authored questions assess recognition and application of the taught distinctions, not professional qualification. You may review the lessons and retry. Repeat attempts reuse the question bank; a remembered answer is not proof of transfer to a new situation.

Saving a lesson records reading only. Previous lesson completions have not been converted into passing scores. You can continue reading without a pass; the assessment remains unpassed.

Question 1

A neuron’s axon carries signals over distance. An oligodendrocyte can form myelin around central axons, altering how efficiently those signals travel.

Which statement correctly includes glia?They support and regulate neural functionThey are empty space between active cells

Question 2

Opening a channel does not push an ion by will. The ion’s net movement depends on its electrochemical gradient and the channel’s selectivity.

What determines net movement through an open ion channel?The cell’s intention aloneThe electrochemical gradient and channel selectivity

Question 3

A resting neuron can maintain a stable voltage while ions still cross the membrane. Stable overall conditions do not mean every molecule is motionless.

Does a stable resting voltage imply no ion movement?No; ongoing flux can coexist with stabilityYes; all ions stop moving

Question 4

A weak input may produce no spike; sufficient input triggers a spike. A stronger sustained input may yield more spikes rather than proportionately larger spikes.

How can stronger sustained input commonly be encoded?By each spike becoming endlessly tallerBy a higher firing rate

Question 5

The same chemical can affect different cells differently because their receptors differ. Calling a transmitter universally happy or sad misses the mechanism.

What helps determine a transmitter’s effect?The receptor and cellular contextOnly the chemical’s popular nickname

Question 6

Several small excitatory inputs close together may reach threshold. An inhibitory conductance can reduce their effectiveness even if excitation is present.

Why might excitatory input fail to produce a spike?Excitatory means every input guarantees a spikeOther inputs and timing affect integration

Question 7

In a myelinated axon, voltage changes spread between nodes where action potentials regenerate. Damage to myelin can impair conduction.

What does myelin primarily support?Efficient signal conduction along axonsCreation of a separate conscious thought at each node

Question 8

A withdrawal response involves peripheral sensory input and spinal circuitry. Calling it peripheral alone leaves out central processing.

Where is the spinal cord classified?Peripheral nervous systemCentral nervous system

Question 9

Visual responses begin with light-sensitive cells, but perceived brightness depends on surrounding context. Equal physical intensity need not appear equally bright.

What does contextual brightness show?Perception depends on processing as well as inputThe eyes receive no physical information

Question 10

Reaching for a cup changes if the cup is heavier than expected. Sensory feedback helps revise force rather than continuing the original command unchanged.

Why does feedback matter during reaching?It replaces every motor command with conscious calculationIt helps correct mismatch between expected and actual movement

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