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27 Cards in this Set
- Front
- Back
What part of the eye constitutes the blind spot?
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optic disc
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Which photoreceptors respond to very dim light?
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rods
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What structure regulates the amount of light passing to the visual receptors of the eye?
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iris
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Farsightedness is more properly called ________.
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hyperopia
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There are three layers of neurons in the retina. The axons of which of these neuron layers form the optic nerves?
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ganglion cells
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True/False: Light passes through the entire thickness of the neural layer of the retina to excite the photoreceptors.
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TRUE
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True/False: The function of the lens of the eye is to allow precise focusing of light on the retina.
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TRUE
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The boundary between the external and middle ear is the:
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tympanic membrane
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Receptors for hearing are located in the ________.
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cochlea
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Where are equilibrium receptors located?
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In the semicircular canals and in the vestibule of the ear.
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There are ____ auditory ossicles in the ear.
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3
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The receptor organ for hearing is the _____
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spiral organ of Corti
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Which ear ossicle connects to the inner ear?
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stapes
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Receptors that detect sound belong which class of receptor?
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mechanoreceptors
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A receptor potential is a type of _____ potential.
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graded
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Nociceptors detect which of the following?
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pain and itch
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The structure whose function is to focus light for clear vision is the __________.
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lens
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The larger the receptive field,
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the harder it is to discriminate the exact point of stimulation.
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Tonic receptors
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are slowly adapting receptors, are activated by parameters that must be continuously monitored by the body, and are proprioreceptors, for example.
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Because of involvement of the __________, pain may be accompanied by emotional distress and nausea or sweating.
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hypothalamus and limbic system
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The ion channels for hearing are in or on the
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stereocilia
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The structure that overlies the organ of Corti is the
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tectorial membrane
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Information about the position of arms, legs, and peripheral joints of the body in space comes from
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proprioceptors.
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The ciliary muscle helps to
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control the shape of the lens
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Put these structures in the correct order in which sound waves are transmitted for hearing. 1. malleus 2. oval window 3. tympanic membrane 4. stapes 5. endolymph 6. perilymph 7. incus
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3, 1, 7, 4, 2, 6, 5
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A sudden flash of bright light would
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cause contraction of the pupillary constrictor muscles.
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Damage to the fovea of the eye would interfere with the ability to
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see color.
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