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Stiffen

stiffen

1. Tiono make stiff; to make less pliant or flexible; as, to stiffen cloth with starch. Stiffen the sinews, summon up the blood. (Shak)

2. To inspissate; to make more thick or viscous; as, to stiffen paste.

3. To make torpid; to benumb.

Origin: See Stiff.


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why do we yawn???

... we just use the air sacs at the bottom of the lungs. If the air sacs, called alveoli, don’t get fresh air, they partially collapse and the lungs stiffen a bit. As a result, it’s believed, our brain prompts the body to either sigh or take a yawn to get more air into the lungs. But certain aspects ...

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by santana8
Wed Aug 24, 2011 12:27 pm
 
Forum: Physiology
Topic: why do we yawn???
Replies: 21
Views: 27840


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