A leg muscle contracts and squeezes a vein. The valves in this vein are working normally.
Which row shows what happens?
Table
| Option | Valve nearer the heart | Valve farther from the heart | Net blood movement |
|---|---|---|---|
| A | closes | opens | away from the heart |
| B | opens | closes | towards the heart |
| C | opens | closes | away from the heart |
| D | closes | opens | towards the heart |
row A
row B
row C
row D
42 exam-style questions on Edexcel GCSE Biology 8.2 Blood and circulation, covering 8.2.1 Structure and function of the blood, 8.2.2 Structure of blood vessels, 8.2.3 Structure of the heart and circulatory system, and 8.2.4 Cardiac output. Each one has a worked solution and a mark scheme showing where the marks go.