Eye Flashcards
(21 cards)
What are sense organs?
Group of receptor cells responding to specific stimuli such as light, sound, touch and temperature.
Sense organs play a crucial role in how organisms perceive their environment.
What is the function of the retina in the eye?
Contains light receptors that receive light energy and convert it to electrical impulses.
The retina is essential for vision and contains two types of receptors: rods and cones.
What types of receptors are found in the retina?
Rods and Cones.
Rods are responsible for vision in low light, while cones are responsible for color vision and detail.
What do the receptors in the retina do with light energy?
Convert it to electrical impulses to be sent to the brain.
This conversion is crucial for the brain to interpret visual information.
How does the eye protect the retina?
The rest of the eye helps to protect the retina and to focus the light on it.
Structures such as the cornea and lens play significant roles in focusing light.
Fill in the blank: The eye contains light receptors in a tissue called _______.
retina.
The retina is located at the back of the eye.
What is the function of the iris?
Controls the size of the pupil to regulate the amount of light entering the eye.
The iris uses circular and radial muscles to adjust pupil size.
What do rods in the retina do?
Sensitive in dim light and not sensitive to colors.
Rods are distributed throughout the retina except for the blind spot and fovea.
What is the function of the cornea?
Refracts light and controls the intensity of light entering through the pupil.
The cornea is transparent and plays a critical role in focusing light.
What is the role of the lens in the eye?
Can change its shape to focus light onto the retina.
The lens works with the ciliary muscle and suspensory ligaments.
What are cones sensitive to?
Bright light and colors.
There are three types of cones sensitive to red, green, and blue light.
Where are the highest number of cones found in the retina?
In the fovea.
The fovea is the region of the retina responsible for sharpest vision.
What is the blind spot?
The point where the optic nerve attaches to the eye and contains no light-sensitive cells.
The blind spot lies at the exit of the optic nerve.
What happens to the pupil in dim light?
The pupil dilates to allow more light to enter.
This is due to the contraction of radial muscles and relaxation of circular muscles.
What are the antagonistic muscles involved in pupil size control?
Circular muscles and radial muscles.
These muscles work against each other to adjust pupil size based on light conditions.
What is the role of the optic nerve?
Carries nerve impulses away to the brain.
It transmits visual information processed by the retina.
What happens to the pupil in bright light?
The pupil constricts to limit light entry.
This occurs when circular muscles contract and radial muscles relax.
What is the structure of the retina?
Contains rod cells for dim light vision and cone cells for color and detail detection.
The retina is light-sensitive tissue that converts light energy to electrical impulses.
Fill in the blank: The _______ is the most sensitive part of the retina.
fovea
The fovea contains the highest concentration of cones and provides the sharpest vision.
What is the function of the ciliary muscle?
Changes the thickness of the lens when focusing.
The ciliary muscle works in conjunction with suspensory ligaments.
True or False: Rods are sensitive to color.
False
Rods are not sensitive to colors; they are specialized for low-light conditions.
