The results table from a hand-squeeze chain investigation is incomplete.
| Measurement | Result |
|---|---|
| total length of the nerve pathway | 6.0 m |
| mean time | ? |
| calculated speed | 2.0 m/s |
Use speed=distance÷time\text{speed}=\text{distance}\div\text{time}speed=distance÷time.
What is the mean time for the hand squeeze to pass along the chain?
4.0 s4.0\ \text{s}4.0 s
0.33 s0.33\ \text{s}0.33 s
12.0 s12.0\ \text{s}12.0 s
3.0 s3.0\ \text{s}3.0 s
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.