## need help asap

Human Anatomy, Physiology, and Medicine. Anything human!

hayleys
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Joined: Tue Nov 29, 2005 3:58 pm

### need help asap

i need to find out the amount of carbon dioxide excreted per min from the lungs

the actual question is

100cm3 of blood in the pulmonary artery carries 55cm3 of carbon dioxide.
100cm3 of blood in the pulmonary vein carries 50cm3 of carbon dioxide.
the total volume of blood circulating through the lungs per min is 5dm3.
the average number of breaths taken per min is 15.
the resting tidal volume is 0.5dm3

cant work it out n e body got n e ideas

MrMistery
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It is a math problem, not a biology one...
Anyway i am to lasy to do it, and i hate math
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

hayleys
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Joined: Tue Nov 29, 2005 3:58 pm
could u please just help me with the equation and i will try it myself

canalon
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### Re: need help asap

hayleys wrote:i need to find out the amount of carbon dioxide excreted per min from the lungs

the actual question is

100cm3 of blood in the pulmonary artery carries 55cm3 of carbon dioxide.
100cm3 of blood in the pulmonary vein carries 50cm3 of carbon dioxide.
the total volume of blood circulating through the lungs per min is 5dm3.
the average number of breaths taken per min is 15.
the resting tidal volume is 0.5dm3

cant work it out n e body got n e ideas

Point 1 and 2 give you how much CO2 is released in the lungs for a given amount of blood circulating.
Point 3 gives you how much blood goes through the lungs per unit of time (1dm3=1000cm3)

Hence you have 5000cm3 of blood coming through the lungs every minutes and you can easily calculate how much CO2 is released from the blood. And you really don't need 3 and 4
Patrick

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)

hayleys
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Posts: 6
Joined: Tue Nov 29, 2005 3:58 pm
so does that mean i multiply 5 by 15 to get my answer

canalon
Inland Taipan
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Joined: Thu Feb 03, 2005 2:46 pm
hayleys wrote:so does that mean i multiply 5 by 15 to get my answer

No... 15 appears in point 3...

Multiply the amount of CO2 released in the lungs by the blood per unit of volume (calculate from 1&2) by the volume of blood coming through the lungs per minute (from 3). Beware of the unit and that should be it
Patrick

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)

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