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