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6 marksNervous Co-ordination

CAPE Biology Unit 2 · 2006 · Paper 2 · Question 2(a)(i)

Students investigated the effect of sodium ions on squid neuron action potentials using normal seawater (A) and 50:50 diluted seawater with distilled water (B).

Use the grid provided to show the results in Table 1 graphically.

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Other parts of this question

  1. 2(a)(ii)State TWO differences between the peaks in A and B.[2 marks]
  2. 2(a)(iii)State ONE cause of the differences between the membrane potentials reached in A and B.[1 mark]
  3. 2(b)On the diagram in Figure 3, complete the labelling of the nerve cell.[1 mark]

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