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2 marksCoordination and Control

CSEC Human and Social Biology · January 2009 · Paper 2 · Question 3(a)(i)

Figure 2 illustrates two structures associated with the human nervous system.

Identify Structure I and Structure II shown in Figure 2.

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Other parts of this question

  1. 3(a)(ii)State the name of the part labelled A in Structure I.[1 mark]
  2. 3(b)(i)Identify the structural feature of a synapse that necessitates the use of chemical neurotransmitters.[2 marks]
  3. 3(b)(ii)Explain how neurotransmitters function at synapses to transmit an impulse.[2 marks]
  4. 3(b)(iii)Explain why people consuming this sweetener would experience difficulty responding to stimuli.[1 mark]
  5. 3(b)(iv)Describe the possible physiological effect if the sweetener triggers spontaneous release of neurotransmitters across synapses.[2 marks]

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