A description that includes four of the following points:
- pupil \{contracts / constricts / gets smaller\} in high light intensity / pupil \{dilates / enlarges\} in low light intensity (1)
- involves circular and radial muscles which are antagonistic (1)
- impulse transmitted along \{motor neurone/ sympathetic nervous system/ parasympathetic nervous system/ nerve\} (to muscle) (1)
- (in bright light / high light intensity) circular muscle contract and radial muscle relax to make pupil \{contract / constrict / get smaller\} (1)
- (in dim light / low light intensity) circular muscle relax and radial muscle contract to make pupil \{dilate / enlarge\} (1)
Can piece together mp1
accept pupil \{contracts / constricts / gets smaller\} to allow less light to enter / pupil \{dilates / enlarges \} to allow more light to enter accept pupil dilates in the dark
ignore optic
accept circular muscle contract and radial muscle relax in \{bright light / high light intensity\}
accept circular muscle relax and radial muscle contract in \{dim light / low light intensity\}