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# Nerve cells are often enclosed in a sheath of myelin, whose functions

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Intern
Joined: 10 Feb 2017
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Location: Viet Nam
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Nerve cells are often enclosed in a sheath of myelin, whose functions  [#permalink]

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12 Oct 2017, 11:01
4
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Difficulty:

5% (low)

Question Stats:

94% (00:49) correct 6% (00:29) wrong based on 41 sessions

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Nerve cells are often enclosed in a sheath of myelin, whose functions include containing nerve impulses within the cell and electric signals traveling more quickly

A. electric signals traveling

B. electric signals can travel

C. electric signals use it to travel

D. allowing electric signals to travel

E. allowing traveling of electric signals
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Joined: 27 Feb 2015
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Re: Nerve cells are often enclosed in a sheath of myelin, whose functions  [#permalink]

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12 Oct 2017, 11:13
Ans is D. containing and allowing
travelling of / to travel

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Re: Nerve cells are often enclosed in a sheath of myelin, whose functions  [#permalink]

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12 Oct 2017, 15:04
D. All others have parallelism error.

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Re: Nerve cells are often enclosed in a sheath of myelin, whose functions  [#permalink]

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12 Oct 2017, 18:46
Hungluu92vn wrote:
Nerve cells are often enclosed in a sheath of myelin, whose functions include containing nerve impulses within the cell and electric signals traveling more quickly

A. electric signals traveling

B. electric signals can travel

C. electric signals use it to travel

D. allowing electric signals to travel

E. allowing traveling of electric signals

"whose functions include containing ... and ...": this list needs to be parallel, so "allowing" is correct here. D and E left.

Correct idiom is "allow to do sth" so D is correct.
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Re: Nerve cells are often enclosed in a sheath of myelin, whose functions &nbs [#permalink] 12 Oct 2017, 18:46
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