★ Organ Senses and Locomotor System Quiz
The structure of the eye that controls how much light reaches the retina is the:
A. Crystalline lens
B. Pupil
C. Sclera
D. Iris
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The receptors used when there is light, that make posible colour vision, are the:
A. Nociceptors
B. Cones
C. Rods
D. Interoceptors
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