Biology 9700 · AS & A Level · The heart

The heart — practice question

The tissues listed below conduct an electrical impulse during the cardiac cycle. In which sequence does the electrical impulse pass through the cardiac cycle?

  • A$1 \rightarrow 2 \rightarrow 3 \rightarrow 4$
  • B$1 \rightarrow 4 \rightarrow 2 \rightarrow 3$
  • C$4 \rightarrow 2 \rightarrow 1 \rightarrow 3$
  • D$4 \rightarrow 2 \rightarrow 3 \rightarrow 1$

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