CAPE Biology Unit 2 · 2013 · Paper 1 · Question Q24

Item 24 refers to the following graph which shows the sigmoid (S-shaped) dissociation curve for haemoglobin of a human adult. During cycling, the partial pressure of oxygen found in the pulmonary vein leaving the lungs and in a vein leaving a muscle is MOST likely

1. (A)\text{pO}_2\text{ (kPa) in Pulmonary Vein Leaving Lungs: } 0, \text{pO}_2\text{ (kPa) in Vein Leaving Muscle: } 12
2. (B)\text{pO}_2\text{ (kPa) in Pulmonary Vein Leaving Lungs: } 2, \text{pO}_2\text{ (kPa) in Vein Leaving Muscle: } 12
3. (C)\text{pO}_2\text{ (kPa) in Pulmonary Vein Leaving Lungs: } 6, \text{pO}_2\text{ (kPa) in Vein Leaving Muscle: } 6
4. (D)\text{pO}_2\text{ (kPa) in Pulmonary Vein Leaving Lungs: } 12, \text{pO}_2\text{ (kPa) in Vein Leaving Muscle: } 2

This question uses a figure or table from the paper — you'll see it when you practise.