need help asap

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hayleys
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need help asap

Post by hayleys » Wed Nov 30, 2005 8:17 pm

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

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MrMistery
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Post by MrMistery » Wed Nov 30, 2005 8:29 pm

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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Post by hayleys » Wed Nov 30, 2005 10:15 pm

could u please just help me with the equation and i will try it myself

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canalon
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Re: need help asap

Post by canalon » Thu Dec 01, 2005 12:51 am

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

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any proof. (Ashley Montague)

hayleys
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Post by hayleys » Thu Dec 01, 2005 6:36 pm

so does that mean i multiply 5 by 15 to get my answer

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canalon
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Post by canalon » Thu Dec 01, 2005 9:25 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

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any proof. (Ashley Montague)

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