using your knowledge 24

question

strabismus, a misalignment of the eyeball caused by an imbalance in the extrinsic eye muscles, is also called lazy eye or wandering eye. Identify the extrinsic eye muscle that would cause lateral strabismus of the right eye
answer

medial rectus
question

why do photographers use a red light in the darkroom when developing black and white film?
answer

the film isn’t sensitive to red light only blue light so it wont get developed
question

name all the accessory eyeball structures, fluids, and retinal layers that light passes through before it hits the photoreceptors
answer

cornea, aqueous humor in aqueous cavity, leans, vitreous body in vitreous cavity, axons from ganglionic cells, ganglionic cell layer, bipolar cell layer, photoreceptor
question

explain why the retina can detach from the eyeball with just a blow to the back of the head
answer

retina is only attached to the eyeball by the optic nerve. If this gets detached or even if a tear forms in the retina and fluid can get between the retina and the eyeball, detachment can occur
question

explain why a pituitary tumor may affect vision
answer

optic chasms superior to pituitary gland and a tumor there may press on optic chiasm
question

a 10 year old boy has 20/20 distance vision and 20/60 near vision. What refraction abnormality does he have?
answer

hyperopia
question

explain why macular degeneration causes loss of vision in the center of the field of vision and blurriness in the periphery
answer

central part of the visual field is abnormal due to degeneration of the mucula lutae in glaucoma, peripheral vision field is affected first
question

what structure keeps a contact lens on the cornea and prevents it from becoming lodged on the posterior surface of the eyeball
answer

conjunctival fold
question

sound waves enter the external auditory canal cause vibrations in structures and fluids of the ear. Identify in order of the structures and fluids that vibrate in the pathway from the external auditory canal to the spiral organ of corti
answer

tympanic membrane, malleus, incus, stapes, oval window, perilymph of scala vestibuli and scala tympani, vestibular membrane, endolymph of cochlear duct, basilar membrane, spiral organ of corti
question

what do the receptor cells for hearing, static equilibrium, and dynamic equilibrium have in common?
answer

they all have hair bundles
question

would the receptors for equilibrium work in space at zero gravity?
answer

crista would still be able to detect rotational acceleration and the macula would be able to detect linear acceleration. However, the macula wouldn’t be able to detect the position of the head bc that is dependent on the effect of gravity on otolithic membrane
question

describe a sense of movements that would stimulate all semicircular duct receptors and if repeated cause vertigo
answer

rotation along the sagittal, coronal, and transverse
question

why do we sniff when we wish to small something better?
answer

we sniff to force air into the superior portion of the nasal cavity. This is the region of the nasal cavity that contains the olfactory receptors
question

when you lick ice cream off an ice cream cone, which papillae are involved in scraping the ice cream off the cone?
answer

filiform papillae
question

licking cold ice cream off an ice cream cone stimulates a variety of sensory receptors associated with the tongue. Name all the sensory receptors involved.
answer

taste buds, cold, touch, and pressure receptors

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