Why do the muscles of the Iris contract and relax?

To alter the size of the pupil, so the correct intensity of light is allowed through. Enough light is let through to allow clear vision, but not so much light that the retina might become damaged.

Answered by Calum M. Biology tutor

7471 Views

See similar Biology GCSE tutors

Related Biology GCSE answers

All answers ▸

What are the different ways in which substances can move across cell membranes?


What are the difference between mitosis and meiosis


How are leaves of a plant adapted to enable photosynthesis?


Why is the overuse of antibiotics dangerous?


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 2013–2024

Terms & Conditions|Privacy Policy
Cookie Preferences