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Alveoli

Alveoli

a small cell containing air in the lungs, a sac-like dilation of the alveolar ducts in the lung (plural: alveoli)


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Diffusion and concentration gradient

Thanks for your reply, but there is no mention of any such mechanism at alveoli level, the exchanges there seem to be completely passive. Would you have any references about 'non-passive' exchanges in the alveoli? I have never heard of that and my course never ...

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by Aymeric
Tue Dec 17, 2013 2:02 pm
 
Forum: General Discussion
Topic: Diffusion and concentration gradient
Replies: 7
Views: 5008

Diffusion and concentration gradient

... that the concentration gradient can be different for several types of molecules in the SAME environment. I don't get that... For example, in the alveoli, dioxygen molecules get into the capillaries because O2 concentration is lower there. However, CO2 concentration is very high in the capillaries. ...

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by Aymeric
Sun Dec 15, 2013 1:02 am
 
Forum: General Discussion
Topic: Diffusion and concentration gradient
Replies: 7
Views: 5008

Re: mammary gland of male in mammals

... breast is essentially the same. There is some controversy as to whether mammary glands are not simply sweat glands that expand and develop more alveoli buds as the breast produces lactose when stimulated with prolactin--the hormone produced primarily during pregnancy and one that is necessary ...

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by Annij
Sun Nov 03, 2013 4:47 am
 
Forum: Evolution
Topic: mammary gland of male in mammals
Replies: 18
Views: 17794

respiratory system

1) you mean in and out of lungs or from alveoli into blood? 3) how do you breath when you're scared? Excited? Etc.

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by JackBean
Fri Aug 16, 2013 2:06 pm
 
Forum: Physiology
Topic: respiratory system
Replies: 1
Views: 1664

respiratory system

what process used by gases to move in and out of alveoli?? what are 3 accessory muscles we may recruit to increase ventilation beyong normal requirement? how does emotional stress affect depth of breathing? thanks!

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by soufieno
Thu Jul 25, 2013 2:29 pm
 
Forum: Physiology
Topic: respiratory system
Replies: 1
Views: 1664
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