Nervous System Practice Test Template Page 8
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1610.
Distance
Time
a) In an experiment to investigate the speed of nerve impulse transmission along two types of nerve
fibres, the data produced are summarized in the above graph.
i. Which of the two nerve fibres (X or Y) would have a myelin sheath (1 mark) b) explain your
choice (2 marks)
ii. It is found that after continuous stimulation for extended periods of time, it becomes difficult to
conduct a nerve impulse along a fibre. Suggest TWO reasons for this (2 marks, 1 mark each)
b) Explain each of the following:
i. slices of potato placed in concentrated salt water lose mass (2 marks)
ii. decreased concentration of salt in the blood may lead to decreased blood pressure (2 marks)
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iii. Substances containing bicarbonate ions (HCO
) are used as a remedy for heartburn or an upset
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stomach. Explain why HCO
may be effective (2 marks)
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iv. If the nucleus of a cell is destroyed, the cell does not die immediately (1 mark)
c) In the diagram above, If an action potential was initiated at neuron X, an impulse would be generated
in A. X only. B. X andY C. X and Z. D. Y and Z.
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