A laboratory technician compares two equal volumes of blood. The results are shown in the table.
| Blood sample | Mean number of red blood cells per mm3\text{mm}^3mm3 of blood | Volume of oxygen carried per 100 cm3 of blood |
|---|---|---|
| P | 4.8 × 106 | 19.2 cm3 |
| Q | 6.0 × 106 | 24.0 cm3 |
Explain why sample Q can carry more oxygen than sample P.
Another sample of blood has 7.2 × 106 red blood cells per mm3\text{mm}^3mm3.
Assume the same relationship between the number of red blood cells and the volume of oxygen carried as in the table.
Predict the volume of oxygen carried by 100 cm3 of this blood.
114 exam-style questions on OCR GCSE Biology 2.2 The challenges of size, covering 2.2.1 Exchange surfaces and surface area : volume ratio, 2.2.2 Substances transported in organisms, 2.2.3 The human circulatory system, 2.2.4 The heart and blood vessels, 2.2.5 Red blood cells and plasma, 2.2.6 Uptake of water and mineral ions by plants, 2.2.7 Transpiration and translocation, 2.2.8 Xylem and phloem, 2.2.9 Environmental factors and water uptake, and 2.2.10 Using a potometer. Each one has a worked solution and a mark scheme showing where the marks go.