A reflex occurs the iris of the human eye in response to changes in light levels - describe how these changes occur, referring to the changes in light level in your answer.

I would most likely present a figure of a dilated & undilated pupal and hopefully this will begin their thought process.
To receive full marks for this answer, I will be looking for the below points:•  pupils dilate in low light levels because• circular muscles (in iris) relax • (and) radial muscles contract

Answered by Brandon S. Physics tutor

1988 Views

See similar Physics GCSE tutors

Related Physics GCSE answers

All answers ▸

What is a convection current?


What's the difference between distance and displacement


Describe how the control rods in a nuclear reactor are used to regulate nuclear fission in a nuclear reactor.


Give two features of polar orbits. Suggest the use of a satellite in a polar orbit.


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences