O-LevelBiologyCoordination & Response5090/11 · Oct/Nov 2017 · Q241 Mark

Which structure does not have its muscles arranged antagonistically?

Athe heart ventricle

Bthe iris

Cthe oesophagus walls

Dthe upper arm

✓ Correct answer

A: the heart ventricle

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2017 Paper 1 Variant 1, question 24.

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