The table shows changes in the concentration of a hormone as blood passes through four organs. Blood flow is equal for all four organs.
Table
| Organ | Concentration entering in arbitrary units | Concentration leaving in arbitrary units |
|---|---|---|
| P | 3 | 8 |
| Q | 7 | 9 |
| R | 9 | 6 |
| S | 5 | 5 |
Which organ shows the greatest net release of the hormone?
organ R
organ S
organ Q
organ P
42 exam-style questions on Edexcel GCSE Biology 7.1 Hormones and coordination, covering 7.1.1 Endocrine glands and hormone transport, 7.1.2 Adrenalin and fight or flight, and 7.1.3 Thyroxine and negative feedback. Each one has a worked solution and a mark scheme showing where the marks go.