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4.1 The two components of the central nervous system shown in the diagram are the brain and the spinal cord.

Biology

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Here are the answers to question 1.4:

1.4.1 The two components of the central nervous system shown in the diagram are the brain and the spinal cord.

1.4.2

  • (a) B: Cerebellum
  • (b) D: Spinal cord

1.4.3

  • (a) The heartbeat: C, Medulla oblongata (or Brainstem)
  • (b) Voluntary actions: A, Cerebrum
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