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  1. Problems
  2. /At rest, 5000 mL of blood passes the tissues in a minute…
MediumBiologyHigh School (11–12)Human Body › Respiratory SystemNumerical

At rest, 5000 mL of blood passes the tissues in a minute…

StemPy LabContributed by StemPy Lab

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

At rest, 500050005000 mL of blood passes the tissues in a minute. Each 100100100 mL of the blood takes up 444 mL of carbon dioxide and delivers it to the alveoli.

  1. How much carbon dioxide is delivered in a minute?
  1. How much is delivered in 101010 minutes, in litres?

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Work it out on paper, then type your number. The answer itself stays hidden.

mL
L
Need a reminder? The key ideaShowHide

Carbon dioxide travels about 707070 per cent as bicarbonate, 202020 to 252525 per cent as carbamino-haemoglobin and about 777 per cent dissolved. Carbonic anhydrase of the red blood cells makes CO2+H2O⇌H2CO3⇌HCO3−+H+\text{CO}_2 + \text{H}_2\text{O} \rightleftharpoons \text{H}_2\text{CO}_3 \rightleftharpoons \text{HCO}_3^- + \text{H}^+CO2​+H2​O⇌H2​CO3​⇌HCO3−​+H+ go forward in the tissues and backward in the alveoli. Each 100100100 mL of deoxygenated blood delivers about 444 mL of carbon dioxide.

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

Given. Flow: 500050005000 mL a minute. Carbon dioxide: 444 mL for each 100100100 mL.

Plan. Count the lots of 100100100 mL, multiply by 444 mL, and scale to 101010 minutes.

Step 1. One minute. 5000100×4=200\dfrac{5000}{100} \times 4 = 2001005000​×4=200 mL.

Step 2. Ten minutes. 200×10=2000200 \times 10 = 2000200×10=2000 mL, which is 222 L.

Answer: 200200200 mL a minute and 222 L in 101010 minutes.

Check. This is a little less than the 250250250 mL of oxygen delivered in a minute at rest.

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  1. Transport of carbon dioxideCarbon Dioxide Transport, Control of Breathing and Respiratory Disorders

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