HotelInfantesAgres - Bawat tanong, may sagot. Logo

In Biology / Senior High School | 2025-07-24

Which part of the eye controls the amount of light that enters?
A. Retina
B. Cornea
C. Lens
D. Iris

Asked by kupzone5815

Answer (1)

The correct answer is D. Iris. The iris is the colored part of the eye that controls the amount of light entering the eye by adjusting the size of the pupil — the small opening in its center. It acts like the aperture of a camera. When there is bright light, the iris contracts to make the pupil smaller, reducing the light that enters. When it's dark, the iris relaxes and the pupil dilates to allow more light in.This adjustment is known as the pupillary light reflex and is essential for protecting the retina, the light-sensitive layer at the back of the eye, from being overexposed to intense light. It also helps improve vision in different lighting conditions.The iris contains smooth muscle fibers that are controlled by the autonomic nervous system:Parasympathetic stimulation causes constriction (less light enters).Sympathetic stimulation causes dilation (more light enters).To distinguish from other eye parts:The retina captures light and converts it into neural signals sent to the brain.The cornea is the transparent front layer that focuses light but does not adjust it.The lens also helps focus light, especially for near or far objects, but doesn’t control light intensity.

Answered by Sefton | 2025-07-26

Related Questions in Biology

[Sagot para sa’yo] What’s happening in nature? Have you noticed any changes in nature around your home or school? Even something simple is important!

[Sagot para sa’yo] Answer true or false to the following statements based on the graphic: a. _______ Enzymes interact with many different substrates. b. _______ Enzymes change shape after a reaction occurs. c. _______ An enzyme can be reused with a new substrate. d. _______ The substrate is changed in the reaction. e. _______ If the shape of the enzyme changed, it would no longer work. f. _______ When all substrates are used, the reaction stops.

[Sagot para sa’yo] ACTIVITY Situation: If you were given the chance to choose among the given 12 career and job opportunities in agriculture, which among those 12 job opportunities would you like yourself to indulge with. And why? Explain your answer intelligently. (Explain your answer in 5-10 sentences). cane you gave me a same with that and like research scientist​

[Sagot para sa’yo] MOST IMPORTANT HUMAN MATERIALS RESOURCES NEEDED IN DOING THE FOLLOWING ACTIVITIES ​

[Sagot para sa’yo] what would happen to the respiratory and circulatory system if one of them isn't working? question answered using RACE and evidence has to be a diagram.