What is the purpose of photoreceptors?(1 point)
Responses
They receive light and turn it into an image.
They receive light and turn it into an image.
They contract and relax to control the pupil.
They contract and relax to control the pupil.
They change light to electrical signals.
They change light to electrical signals.
They focus the light coming into the eye.
They receive light and turn it into an image.
In which organizational level is the eye?(1 point)
Responses
cells
cells
tissues
tissues
organs
organs
organ systems
organs
Many parts of the eye work to focus or control light except the(1 point)
Responses
retina.
retina.
cornea.
cornea.
lens.
lens.
pupil.
retina.
The purpose of photoreceptors is to change light to electrical signals.
The correct answer is: They change light to electrical signals.
Photoreceptors are specialized cells located in the retina of the eye. Their primary function is to detect and convert incoming light into electrical signals that can be interpreted by the brain as visual information. This process is essential for our ability to see and perceive our surroundings.
To arrive at this answer, you can break down the options and determine their accuracy:
1. "They receive light and turn it into an image."
This option is not entirely accurate because photoreceptors do not directly create images, but rather convert light into electrical signals that are sent to the brain.
2. "They contract and relax to control the pupil."
This option is incorrect. The contraction and relaxation of muscles within the iris control the size of the pupil, not the photoreceptors.
3. "They change light to electrical signals."
This option is correct. Photoreceptors, specifically the rods and cones, convert light energy into electrical signals through a process called phototransduction. These signals are further processed and transmitted to the brain for interpretation.
4. "They focus the light coming into the eye."
This option is incorrect. The focusing of light onto the retina is primarily done by the cornea and the lens, not by photoreceptors.
Therefore, the accurate answer is that photoreceptors change light to electrical signals.