A laboratory investigates a voluntary response. A volunteer feels a brief pressure on the shoulder and then raises one arm to interrupt a light beam. The timing equipment adds a delay of 0.040 s to every recorded time.
| Trial | Recorded time / s |
|---|---|
| 1 | 0.34 |
| 2 | 0.29 |
| 3 | 0.31 |
| 4 | 0.33 |
| 5 | 0.28 |
Calculate the mean response time of the volunteer, after correcting for the delay caused by the timing equipment.
Name the effector that raises the volunteer's arm.
111 exam-style questions on Edexcel GCSE Biology 2.3 The nervous system and brain, covering 2.3.1 Structures and functions of the brain, 2.3.2 Imaging brain function with scanning, 2.3.3 Limitations in treating nervous system damage, 2.3.4 Neurones and impulse transmission, and 2.3.5 Structure and function of a reflex arc. Each one has a worked solution and a mark scheme showing where the marks go.