BMS 143: Vision Visible Light and Photoreceptors Quiz

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What is the range of wavelengths for visible light?

200 nm to 500 nm

400 nm to 700 nm (correct)

300 nm to 800 nm

600 nm to 900 nm

Which statement about perceived color is correct?

Perceived color is the wavelength that is absorbed by objects

Perceived color is the wavelength that is refracted by objects

Perceived color is the wavelength that is reflected by objects (correct)

Perceived color is the wavelength that is diffracted by objects

What happens when ciliary muscles are relaxed?

Suspensory ligaments relax, and the lens flattens

Suspensory ligaments pull, and the lens rounds

Suspensory ligaments relax, and the lens rounds

Suspensory ligaments pull, and the lens flattens (correct)

Which part of the eye is responsible for adjusting the lens strength?

Ciliary muscles Signup and view all the answers

What is the legal definition of blindness?

Best corrected vision ≤ 20/200 Signup and view all the answers

What is the cause of nearsightedness (myopia)?

The eyeball is too long, and the lens doesn't relax enough Signup and view all the answers

Which type of lens is used to correct farsightedness (hyperopia)?

Convex lens Signup and view all the answers

What is the purpose of the Snellen eye chart?

To determine visual acuity Signup and view all the answers

What is the function of the optic chiasm?

It allows the lateral side of the visual field to cross over. Signup and view all the answers

What happens in the case of a unilateral optic nerve lesion?

Loss of peripheral vision in the affected eye. Signup and view all the answers

What is the primary role of lateral inhibition in the retina?

To enhance contrast and edge detection. Signup and view all the answers

Which cells in the retina are responsible for converting light stimuli into electrical signals?

Rods and cones. Signup and view all the answers

How does the brain perceive depth perception?

By comparing the disparate images from each eye. Signup and view all the answers

What is the approximate ratio of rods to cones in the human retina?

20:1 Signup and view all the answers

What is the process of convergence in the visual system?

The reduction in the number of cells from photoreceptors to ganglion cells. Signup and view all the answers

Which cells in the retina transmit signals to the brain via the optic nerve?

Ganglion cells. Signup and view all the answers

What is the main function of the optic disc?

Causes a blink spot Signup and view all the answers

Which type of photopigment is found in the rod membrane?

Rhodopsin Signup and view all the answers

Where is the metabolic machinery of the cell located in a photoreceptor?

Inner segment Signup and view all the answers

What is the function of the synaptic terminal in a photoreceptor?

Stores and releases neurotransmitters to bipolar cells Signup and view all the answers

Which photopigment is associated with cones responsible for color vision?

L-type Signup and view all the answers

What is the main difference between rods and cones regarding light sensitivity?

Rods need more light to activate Signup and view all the answers

How does light affect signal transduction in the visual system?

Light activates photopigments triggering signal transduction Signup and view all the answers

Which of the following statements about the opponent-process theory is correct?

It describes the interaction between the blue-yellow and green-red color channels. Signup and view all the answers

Which of the following is NOT a type of color blindness mentioned in the text?

Deuteranopia Signup and view all the answers

What is the primary function of the pupillary sphincter?

To constrict the pupil and restrict light entering the eye. Signup and view all the answers

Which of the following statements about light sensitivity is correct?

It depends on the quantity of photopigments in the rods and cones. Signup and view all the answers

What happens when the eye is exposed to intense light, such as sunlight?

Photopigments are broken down, decreasing photoreceptor sensitivity. Signup and view all the answers

Which process allows the eye to adapt to the absence of light (dark conditions)?

Photopigment regeneration Signup and view all the answers

What is the term used to describe the process of moving from a dark environment to a bright one?

Light adaptation Signup and view all the answers

What happens to the image perceived by the eye when moving from a dark environment to a bright one?

The entire image appears bleached due to low photoreceptor sensitivity. Signup and view all the answers

Which of the following statements about the pupillary dilator is correct?

Its dilation increases the amount of light entering the eye. Signup and view all the answers

Which nervous system controls the contraction of the pupillary sphincter?

Parasympathetic Signup and view all the answers