The table shows some features of different blood vessels.
| Presence of valves | Thickness of wall | Size of lumen | |
|---|---|---|---|
| A | Yes | Thin | Large |
| B | No | Thick | Small |
| C | Yes | Thick | Large |
| D | No | Thin | Small |
Which row in the table correctly describes the structure of veins?
Row A
Row B
Row C
Row D
194 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.