Question 12
(12) The table shows features of some blood vessels. Which set of features describes the pulmonary artery? [1 mark]
| Option | Muscle layer | Lumen | Direction of blood flow | Blood |
| --- | --- | --- | --- | --- |
| A | thick | narrow | away from the heart | deoxygenated |
| B | thick | wide | away from the heart | oxygenated |
| C | thin | narrow | towards the heart | oxygenated |
| D | thin | wide | towards the heart | deoxygenated |
| Option | Muscle layer | Lumen | Direction of blood flow | Blood |
| --- | --- | --- | --- | --- |
| A | thick | narrow | away from the heart | deoxygenated |
| B | thick | wide | away from the heart | oxygenated |
| C | thin | narrow | towards the heart | oxygenated |
| D | thin | wide | towards the heart | deoxygenated |