Fully saturated blood holds 20 mL of oxygen in each 100 mL…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Fully saturated blood holds mL of oxygen in each mL. Blood leaves the lungs per cent saturated. At rest it returns from the tissues per cent saturated. During hard exercise it returns per cent saturated.
- How much oxygen does each mL of blood give up at rest?
- How much does it give up during hard exercise?
- How many times more is that?
Need a reminder? The key ideaShow
The oxygen dissociation curve is S-shaped. At mm Hg haemoglobin is about per cent saturated, and at mm Hg about per cent. A higher pCO, more hydrogen ions or a higher temperature shift it to the right, and oxygen is released more easily.
The worked solution
Have you tried it?
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. Full blood: mL in mL. Saturation leaving the lungs: . Returning: at rest and in exercise.
Plan. The fall in saturation times mL gives the oxygen given up.
Step 1. At rest. mL.
Step 2. In exercise. mL.
Step 3. Ratio. times.
Answer: mL, mL and times.
Check. The rest value is close to the mL of the textbook. A shift of the curve to the right is one reason for the larger value in exercise.
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