CH16 PT 16 /3

Réussis tes devoirs et examens dès maintenant avec Quizwiz!

Match each photopigment to the type of retinal cell that produces it.

- Rhodopsin:Rods- Photopsin:Cones- Melanopsin:Ganglion cells

Most human color vision is based upon comparing signals generated by how many types of cones?

3 THREE

Which describes the optic disc?

An area of the retina lacking photoreceptors

What fluid is secreted by the ciliary body?

Aqueous humor

Which fluid is secreted by the ciliary body and fills the anterior cavity of the eye?

Aqueous humor

Which type of retinal cell synapses with the photoreceptors and functions as a first order neuron in the visual pathway?

Bipolar cells

The is a highly vascular, deeply pigmented portion of the vascular tunic located behind the retina.

Choroid

The suspensory ligament attaches the lens to which of the following structures?

Ciliary body

Which structure secretes the aqueous humor?

Ciliary body

Which are the photoreceptors that are primarily responsible for photopic (day) and trichromatic (color) vision?

Cone

Which type of photoreceptor is primarily responsible for photopic (day) vision and trichromatic (color) vision?

Cone cell

Which are types of photoreceptor cells?

Cones Rods

Which describe the choroid?

Contains numerous capillaries Part of the vascular tunic (layer) Highly pigmented

Astigmatism may result from an irregularity in which of the following structures?

Cornea

The anterior chamber of the eye is located between which two structures?

Cornea and iris

Failed convergence of the eyes produces double-vision, also known as which of the following?

Diplopia

The term refers to a relaxed state in which the eyes are focused on far away objects.

Emmetropia

When eyes are focusing on far away objects, they are in which state?

Emmetropia

True or false: As we age, the near point of vision decreases.

False

Which portion of the retina produces the greatest visual acuity (sharpness of image)?

Fovea centralis

Which type of retinal cells function as second-order neurons in the visual pathway, as well as occasionally functioning as photoreceptors?

Ganglion cell

The axons of which retinal cells form the optic nerve?

Ganglion cells

Which term refers to difficulty in viewing nearby objects?

Hyperopia

Which layer of the eyeball includes the retina?

Internal

Which structures are part of the vascular layer of the eyeball?

Iris Ciliary body Choroid

The posterior chamber of the eye is located between which two structures?

Iris and lens

Which are functions of the vitreous body?

Keeps retina smooth Maintains intraocular pressure

The vitreous body, or humor, is a jelly-like substance located between what two structures of the eye?

Lens and retina

Which term refers to a patch of cells in the center of the retina?

Macula lutea

Which type of cone contains a photopsin that is maximally sensitive to wavelengths of light around 531 nm?

Medium-wavelength cones

Which term refers to difficulty in viewing distant objects?

Myopia

What are the two moieties of rhodopsin?

Opsin Retinal

Which area of the retina lacks photoreceptors and is therefore referred to as the "blind spot"?

Optic disc

Rods and cones are examples of which of the following?

Photoreceptor cells

As light passes through different mediums, its path will bend. What is this called?

Refraction

Which structure contains photoreceptors?

Retina

Name the visual pigment present in rods.

Rhodopsin

Which are the photoreceptor cells responsible for night vision?

Rods

Rod cells are primarily responsible for which type of vision?

Scotopic

Which would be true about a person with only one eye?

She would have impaired stereoscopic vision.

The inner layer of the eye contains which of the following?

Start of optic nerve Retina

Having two eyes with overlapping visual fields is necessary for which of the following

Stereoscopic vision

Having two eyes with overlapping visual fields is necessary for which of the following?

Stereoscopic vision

The ligament attaches the lens of the eye to the ciliary body.

Suspensory

What is the function of the lens?

To focus light onto the retina

True or false: Inverted images are focused onto the retina by the lens.

True

True or false: Sensitivity differences during light and dark adaptation result, at least in part, from the difference in bleaching and regeneration rates of photopsin and rhodopsin.

True

True or false: The pigment epithelium of the retina is a darkly pigmented layer that absorbs stray light.

True

The choroid, ciliary body, and iris belong to which of the three tunics of the eye?

Vascular

Which term refers to a molecule that plays a crucial role in visual transduction by changing shape when it absorbs certain wavelengths of light?

Visual pigment

The body is a jelly-like substance located between the lens and the retina of the eyeball.

Vitreous

cells are first-order retinal neurons that synapse with photoreceptors.

biopolar

Which type of retinal cell synapses with the photoreceptors and functions as a first order neuron in the visual pathway?

bipolar

_____ cells are first-order retinal neurons that synapse with photoreceptors.

bipolar

Stereoscopic vision provides for which of the following?

depth

By definition, ___ is double vision resulting from failure of convergence.

diplopia

The visual adjustment that is made when you go from a dark or dimly lit area to a brighter area is called adaptation.

light adaptation

Which term refers to difficulty in viewing distant objects?

myopia

The duct connects the lacrimal apparatus to the nasal cavity.

nasolacrimal

The point of vision refers to the closest an object can be to the eyes and still be focused.

near

The point of vision refers to the closest an object can be to the eyes and still be focused.

near, focal

is the visual pigment present in cones.

photopsin

Rhodopsin is an example of a visual , a molecule that plays a crucial role in visual transduction by changing shape when it absorbs certain wavelengths of light.

pigment

The epithelium of the retina absorbs stray light.

pigmented, pigment, or Pigmented

Which part of the eye forms from a cup-shaped outgrowth of the diencephalon and is actually considered part of the brain?

retina

The choroid is ______.

very vascular


Ensembles d'études connexes

Upper and Lower Motor Neuron Lesions

View Set

The Tragedy of Julius Caesar, Part 2: Causal Relationships

View Set

AMSCO AP US History Chapter 1 - 5

View Set

Final Exam 2nd Semester ECON 201

View Set

Chapter 11: The Health Care Delivery System

View Set

Taylor Review Questions - Safety, Security and Emergency Preparedness

View Set