Which part of the eye contains rods and cones?
Reveal answer
The retina.
Key words: retina
3(j) CO-ORDINATION AND RESPONSE · RECALL
3.41 Structure and function of the eye
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What does the iris do?
Reveal answer
Controls the size of the pupil and so how much light enters.
Key words: pupil
What does the optic nerve do?
Reveal answer
Carries impulses from the retina to the brain.
Key words: impulses
Rods vs cones?
Reveal answer
Rods: dim light, no colour. Cones: bright light, colour, many at fovea.
Key words: colour
Why is there a blind spot?
Reveal answer
No receptors where the optic nerve leaves.
Key words: optic nerve
What is meant by the term retina?
Reveal answer
Light-sensitive layer containing photoreceptors.
Key words: retina
What is meant by the term iris?
Reveal answer
Muscular ring controlling pupil diameter.
Key words: iris
What is meant by the term accommodation?
Reveal answer
Adjustment of lens shape to focus at different distances.
Key words: accommodation
What is meant by the term fovea?
Reveal answer
Retinal region with many cones and high visual acuity.
Key words: fovea
Eye structures and functions: for Cornea, give the feature and the function.
Reveal answer
Feature: Curved and transparent. Function: Refracts most incoming light.
Key words: Cornea
Eye structures and functions: for Iris and pupil, give the feature and the function.
Reveal answer
Feature: Muscular ring around an aperture. Function: Controls light entry.
Key words: Iris and pupil
Eye structures and functions: for Lens, give the feature and the function.
Reveal answer
Feature: Transparent and elastic. Function: Fine-focuses light.
Key words: Lens
Eye structures and functions: for Ciliary muscle and suspensory ligaments, give the feature and the function.
Reveal answer
Feature: Antagonistic support system. Function: Changes lens shape.
Key words: Ciliary muscle and suspensory ligaments
Eye structures and functions: for Retina, give the feature and the function.
Reveal answer
Feature: Rods and cones. Function: Transduces light.
Key words: Retina
Eye structures and functions: for Optic nerve, give the feature and the function.
Reveal answer
Feature: Bundle of sensory axons. Function: Carries impulses to brain.
Key words: Optic nerve
True or false, and why? “The pupil is a muscle.”
Reveal answer
False. It is the opening controlled by iris muscles.
True or false, and why? “The lens supplies most refraction.”
Reveal answer
False. The cornea supplies most; the lens adjusts focus.
True or false, and why? “The optic nerve detects light.”
Reveal answer
False. Retinal receptors detect light; the nerve carries their signals.