A&P Ch 15&16 practice questions

Which are true of rods?

- There are more than 100 million rod cells per eye - They function well in dim light

Which events occur during bright light adaptation?

- cones gradually adjust - rods become inactive - pupils constrict

ora serrata

A is what

B

Ciliary muscle (vascular tunic)is what letter

The optic disc is associated with ______.

Cranial nerve II (the optic nerve)

True or false: The eye is spherical, measuring about 5 centimeters in diameter, and most of it is receded into the orbit of the skull.

False: The eye is about 2.5 cm

C

Retina is what letter

A

Sclera (fibrous tunic) is what letter in the picture

Hearing and equilibrium are transmitted along which cranial nerve?

VIII

tectorial membrane

What is A

B

What region of the eye contains the ciliary body?

A feature common to all receptors is ______.

ability to respond to a stimulus

Which cavity of the eyeball is divided into an anterior and posterior chamber?

anterior cavity

What chamber is between the iris and cornea?

anterior chamber

When the membrane moves, the on the spiral organ hair cells distort because they are anchored by the tectorial membrane.

basilar, stereocilia

Receptors initiate sensory input to the ______.

central nervous system

Gustatory cells are ______.

chemoreceptors

What structure is filled with pigment from melanocytes?

choroid

Which structure of the eye absorbs light to prevent it from scattering within the eye?

choroid

The iris is continuous with the ______

ciliary body

The auditory sensory axons of the_____branch of cranial nerve number______terminate in the cochlear nucleus within the brainstem.

cochlear; VIII

What type of photoreceptors detects color?

cones

As we adjust to low light, our ______ becomes nonfunctional and it may take ______ for rhodopsin to become regenerated sufficiently so that you can see well in low-light conditions.

cones; 20-30 minutes

The limbus is the junction between the sclera and the ______.

cornea

part of the fibrous tunic?

cornea and sclera

When you go from a bright light environment to a dark environment, you have a slow sensitivity to low light levels. This is called ________ ________

dark adaptation

Light rays are refracted or bent when they pass through two media of different ______.

densities

Which is an accessory structure of the eye?

eyebrow

The outmost layer of the eye is called the ______ tunic.

fibrous

The term equilibrium refers to our awareness and monitoring of our position.

head

The vestibulocochlear nerve transmits ______ information.

hearing and equilibrium

Pain is an example of a ______ sense.

in general

The retina is the ______ layer of the eye wall.

internal

the sclera ______.

is made of dense connective tissue provides for eye shape

Optic tracts extend to which structures after they leave the optic chiasm?

lateral geniculate nucleus of the thalamus, and the superior colliculi

The process by which your eyes adjust from low light to bright light conditions is ______.

light adaptation

Tactile receptors are a type of ______.

mechanoreceptor

Where are photoreceptors located?

neural layer of the retina

Optic tracts ultimately are directed to the primary visual cortex in the ______ lobe.

occipital

The sense of smell is called

olfaction

A lack of photoreceptors in this structure creates the "blind spot"?

optic disc

What type of receptor can undergo adaptation?

phasic

The iris controls the size of the ______.

pupil

Most of the eye is ______ the orbit of the skull.

receded into

The area that a receptor cell gathers information from is called the ______.

receptive field

Some individuals experience pain in their left shoulder during a heart attack. This is an example of ______.

referred pain

______ occurs when impulses from an organ are perceived as originating from the skin.

referred pain

The apparent distortion of the spoon in the water glass is due to the phenomenon called

refraction

Olfactory receptors ______.

respond to volatile compounds (smell)

Sensory receptors in which structures help monitor and adjust our equilibrium?

saccule, utricle, and semicircular ducts

What structure is the "white" of the eye?

sclera

What structure makes up the posterior 5/6 of the fibrous tunic?

sclera

Which part of the eye is an attachment site for extrinsic eye muscles?

sclera

Receptors for general senses are usually ______.

simple structure

Localization and sensitivity are easily determined in a ______ receptive field.

small

Olfaction is the sense of ______.

smell

Taste buds are found on the tongue and ______.

soft palate

Mechanoreceptors located in the skin and mucous membranes are called ______ receptors.

tactile

The middle and inner ear are in which bone?

temporal bone

Gustation is the sense of ________

to taste

The cornea is ______.

transparent

The vascular tunic of the eye is also called the ______.

uvea

Which layer of the eye contains the blood and lymph vessels?

vascular tunic

Receptors that exhibit rapid adaption to a constant stimulus are ____ receptors.

adapting