A strange species of worm has a simple nervous system that regulates turning to

Question

A strange species of worm has a simple nervous system that regulates turning to the right or the left.
Each side of the worm has one neuron which stimulates turning. A neuron that uses the neurotransmitter
dopamine is on the left side of the worm, and activity of this neuron causes the worm to turn to the left. A
neuron that uses the neurotransmitter enkephalin is on the right side of the worm, and activity of this
neuron causes the worm to turn to the right. When the neurons on each side are equally active, the worm
moves straight ahead, and velocity is proportional to the amount of neuron activity. When the neuron on
one side is more active than the one on the other side, then the worm turns to the side with the most
neuronal activity. Before receiving drugs, the worm is traveling straight ahead at a moderate rate of
speed, which means that the neurons on both sides are signaling at moderate, equal rates.

5. Which way does the worm turn after taking naloxone?
a. to the left
b. to the right
c. continues straight ahead

6. Which way does the worm turn after taking heroin if it has no enzymes that metabolize heroin?
a. to the left
b. to the right
c. continues straight ahead

7. Which way does the worm turn after taking oxycontin?
a. to the left
b. to the right
c. continues straight ahead

Explanation / Answer

5. Which way does the worm turn after taking naloxone? a. to the left 6. Which way does the worm turn after taking heroin if it has no enzymes that metabolize heroin? c. continues straight ahead 7. Which way does the worm turn after taking oxycontin? a. to the left

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