CAIE A Level Biology 9700 · Control and coordination
A labelled diagram of a sarcomere from striated muscle shows the arrangement of actin and myosin filaments, with Z-lines, M-line, A-band, I-band, and H-zone clearly marked. Calcium ions are crucial for two processes: transmission across a cholinergic synapse and contraction of striated muscle.
Compare the role of calcium ions in the functioning of a cholinergic synapse and in the contraction of striated muscle. Refer to the sarcomere structure in your answer.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
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