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Networks of blood vessels in humans’ arteries serve only

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Networks of blood vessels in humans’ arteries serve only  [#permalink]

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New post Updated on: 31 Oct 2017, 18:20
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  85% (hard)

Question Stats:

46% (01:17) correct 55% (01:30) wrong based on 200 sessions

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Networks of blood vessels in humans’ arteries serve only to disperse heat generated in activities. This heat is generated only because humans move their limbs. Thus orthopedics’ recent discovery that the ancient humans Neanderthals had similar networks of blood vessels in the arteries of their bodies provides evidence for the hypothesis that Neanderthals moved their limbs, just as humans do.

The argument in the passage relies on which of the following assumptions?

A. Neanderthals would not have had networks of blood vessels in the arteries of their bodies if these networks were of no use to Neanderthals.

B. All creatures that moved around by flapping their limbs have networks of blood vessels in the arteries of their bodies.

C. Ancient humans who moved their limbs in flight would have been able to fly more effectively than those humans who did not move their limbs.

D. If Neanderthals moved around by moving their limbs , then orthopedics would certainly be able to find some evidence that they did so.

E. Heat generated by Neanderthals in moving their limbs in motion could not have been dispersed by anything other than the blood vessels in their arteries

Similar question from OG: LINK

Originally posted by atulindia on 31 Oct 2017, 11:29.
Last edited by broall on 31 Oct 2017, 18:20, edited 1 time in total.
Reformatted question, OA added
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Re: Networks of blood vessels in humans’ arteries serve only  [#permalink]

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New post 31 Oct 2017, 13:46
A for me,

Neanderthals could have other options to disperse their heat, that does not affect the argument in the passage, therefore E is out.
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Re: Networks of blood vessels in humans’ arteries serve only  [#permalink]

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New post 31 Oct 2017, 17:41
Modified version of:

Networks of blood vessels in bats’ wings serve only to disperse heat generated in flight. This heat is generated only because bats flap their wings. Thus paleontologists’ recent discovery that the winged dinosaur Sandactylus had similar networks of blood vessels in the skin of its wings provides evidence for the hypothesis that Sandactylus flew by flapping its wings, not just by gliding.

The argument in the passage relies on which of the following assumptions?

A) Sandactylus would not have had networks of blood vessels in the skin of its wings if these networks were of no use to Sandactylus.

B) All creatures that fly by flapping their wings have networks of blood vessels in the skin of their wings.

C) Winged dinosaurs that flapped their wings in flight would have been able to fly more effectively than winged dinosaurs that could only glide.

D) If Sandactylus flew by flapping its wings, then paleontologists would certainly be able to find some evidence that it did so.

E) Heat generated by Sandactylus in flapping its wings in flight could not have been dispersed by anything other than the blood vessels in its wings.

OA is A
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Re: Networks of blood vessels in humans’ arteries serve only  [#permalink]

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New post 01 Nov 2017, 12:10
Why E is wrong?, if apply negation test on E conclusion falls apart. can someone share the detailed expalnation
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Re: Networks of blood vessels in humans’ arteries serve only  [#permalink]

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New post 04 Nov 2017, 10:24
atulindia wrote:
Why E is wrong?, if apply negation test on E conclusion falls apart. can someone share the detailed expalnation


Not really.

I too selected E. But if you look closer you will find that heat generation per se has nothing to the with the conclusion, but rather one of the premises.

In Assumption, the conclusion MUST be true. So even though option E is true for one of the premise, it is not necessarily true for the conclusion.

The negation test for option A affirms this.
Re: Networks of blood vessels in humans’ arteries serve only &nbs [#permalink] 04 Nov 2017, 10:24
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