PrepTest 107, Section 2, Question 18
Scientists have long known that the soft surface(465 more words not shown)
During the studies supporting Bohringer's(25 more words not shown)
- AThe electroreceptors sent(8 more words not shown)
- BThe neocortex induced(6 more words not shown)
- CThe mechanoreceptors sent(11 more words not shown)
- DThe platypus opened(5 more words not shown)
- EThe fifth cranial(8 more words not shown)
Reading the passage
Follow the sequence rather than getting stuck on the anatomy: touching the bill sends a signal through the fifth cranial nerve to the neocortex, then to the motor cortex. The snapping movement comes afterward. We're looking for something that happened before the signal reached the motor cortex, not necessarily immediately before.
Working the answers
- A
Wrong receptors. This study concerns touch and mechanoreceptors, not the electroreceptors involved in detecting electric fields.
- B
The snapping follows the motor-cortex signal; it isn't an earlier event. The text also attributes it, presumably, to impulses from the motor cortex rather than directly to the neocortex.
- C
The signal travels to the neocortex, not to the electroreceptors. This inserts the other sensory system into the touch pathway.
- D
No opening of the pores is described. We shouldn't invent that as a step just because pores are mentioned.
- ECorrect
The text traces the signal along cranial nerve V, then through the neocortex to the motor cortex (paragraph 1). Reaching the neocortex by that nerve therefore occurs before reaching the motor cortex.
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