Neuroscience and the Nervous System Quiz

Question 1A signal travels 0.84 m at a constant 42 m/s. Ignore synaptic delays. Calculate its travel time in ms, rounded to two decimals. Use 1000 ms = 1 s.

Enter a number in ms.

Answers within 0.005 ms of the expected value are accepted.

Question 2Myelin is damaged around an axon while the axon remains intact. Which change most directly follows?

Faster passage caused by reduced electrical insulationAn unchanged signal because the axon is still intactA larger impulse produced by each exposed segmentAltered timing of signals reaching connected cells

Question 3At a chemical synapse, vesicles fuse with the sending cell’s membrane. What happens next?

An action potential jumps across the gap to the next axonThe vesicles pass intact into the receiving nerve cellTransmitter reaches receptors on the receiving membraneThe two cells join into a continuous conducting tube

Question 4A learner practices a new skill over several days. Which cellular change would provide a basis for retaining it?

A brief fluctuation that ends as soon as stimulation stopsA lasting adjustment of communication between these cellsA permanent increase in the size of each nerve impulseA complete replacement of the learner’s inherited DNA

Question 5An injury to one region impairs speech. Which interpretation respects how complex abilities are organized?

The undamaged regions have no role in spoken languageA single location contains the entire ability to speakAn impairment determined by injury size rather than locationA failed node within a wider network supporting speech

Question 6After lifting an unexpectedly light box, a person uses less force on the next attempt. What explains the adjustment?

A correction of the predicted effort using sensory feedbackMuscle activity proceeds independently of incoming signalsMotor commands are identical when the intended action stays the samePrediction is unnecessary once a movement has been attempted

Question 7After learning, a group sleeps and later performs better on a memory task. Recordings show organized stages of neural activity during sleep. Which description fits these findings?

A period when memory contents are copied exactly like filesA complete stop in the electrical activity of the brainA regulated phase that helps consolidate recent experienceA uniform shutdown that leaves neural chemistry fixed

Question 8A substance blocks a receptor rather than activating it. How is that action classified?

Electrical insulation added around the responding axonAntagonism that reduces the target’s receptor responseAgonism that directly increases receptor activationCreation of the transmitter by removing its receptor

Question 9A claim says an adult brain routinely replaces neurons throughout its tissue. Which correction fits the evidence?

Restricted neuron production with an uncertain role in adult humansRoutine replacement supplies a fresh cell for each daily experienceHuman neuron replacement matches laboratory animals in rate and locationNeurogenesis replaces distributed circuits with isolated storage cells

Question 10During a task, an imaging signal rises in a region. What additional evidence would strengthen a causal account?

A controlled intervention affecting the proposed mechanismA more vivid description of the participant’s experienceA larger anatomical label attached to the active regionA brighter color scale applied to the same imaging results

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Neuroscience and the Nervous System Quiz

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