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Problem 10.6a
Your 60-year-old patient, Mr. Guster, has Bell's palsy, which causes dysfunction of those portions of the facial nerve that control muscles of facial expression. He is surprised when you tell him to tape the eyelids of his right eye closed at night to prevent dryness. Why might Bell's palsy cause dryness of the eye on the affected side?
Problem 15.10a
Why can you see an object better in dim light by looking to the side of it instead of directly at it?
Problem 15.1a
1. Match the cell type with the correct stimulus.
____Rod or cone
____Hair cell in cochlea
____Gustatory cell
____Olfactory neuron
____Hair cell in vestibule
a. Head movement
b. Odorant
c. Photon
d. Taste substance
e. Sound wave
Problem 15.1a
Explain what would happen to your sense of smell if there were no basal cells present in the olfactory epithelium.
Problem 15.1a
Mr. Spencer suffers loss of taste sensation. Tests reveal that his taste buds and salivary glands are functional. What other structures might be impaired that would explain his loss of taste?
Problem 15.11a
Each of the following statements is false. Correct each statement to make it true.
a. Photons are absorbed by rhodopsin in retinal ganglion cells.
Problem 15.11b
Each of the following statements is false. Correct each statement to make it true.
b. Rods and cones are found in the fovea centralis.
Problem 15.11c
Each of the following statements is false. Correct each statement to make it true.
c. In the dark, rods and cones produce action potentials.
Problem 15.12a
he axons from the nasal retina in the left eye terminate in the:
a. right lateral geniculate nucleus.
b. left lateral geniculate nucleus.
c. right medial occipital lobe.
d. left medial occipital lobe.
Problem 15.13a
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
a. The incus is connected to the tympanic membrane.
Problem 15.13a
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
e. The semicircular ducts are connected to the utricle, and the cochlear duct is continuous with the saccule.
Problem 15.13b
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
b. The stapes is attached to the oval window.
Problem 15.13c
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
c. The auditory canal is separated from the middle ear by the round window.
Problem 15.13d
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
d. The cochlear duct is filled with perilymph.
Problem 15.13f
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
f. The spiral organ is located in the scala tympani.
Problem 15.14a
Explain how sounds of different frequencies are detected in the cochlea.
Problem 15.15a
How do the hair cells of the crista ampullaris detect rotation of the head?
Problem 15.16a
The macula in the utricle detects:
a. rotation of the head to the right.
b. very low-frequency sound waves that we can feel but not hear.
c. tilting of the head to one side.
d. linear acceleration of the head in a vertical plane.
Problem 15.17a
Fill in the blanks: The spiral organ sits on the________membrane, and the stereocilia of the outer hair cells contact the _____membrane.
Problem 15.18a
True or false: Hair cells in the spiral organ will depolarize or hyperpolarize, depending on the direction in which the stereocilia are bent.
Problem 15.19a
Which of the following is not part of the auditory pathway in the CNS?
a. Superior temporal lobe
b. Superior colliculus
c. Medial geniculate nucleus
d. Nuclei in the pons
e. Cochlear nuclei
Problem 15.2a
The axons of the olfactory nerve terminate in the:
a. olfactory epithelium.
b. olfactory bulb.
c. olfactory tract.
d. primary olfactory cortex.
Problem 15.20a
Fill in the blanks: In the ampulla of a semicircular duct, the hair cells are located in the_____and their stereocilia and kinocilium are embedded in the______.
Problem 15.2a
In which direction would you be unable to move your right eye if your right abducens nerve were damaged?
Problem 15.2a
Your friend tells you that she has just been diagnosed with myopia, and she wonders if staring at her computer screen too much might have caused her problem. What do you tell her?
Problem 15.21a
Stimuli from the inner ear regarding head movement and position are sent to all of the following except the:
a. vestibular nuclei.
b. oculomotor nucleus.
c. parietal lobe.
d. cerebellum.
e. trigeminal nucleus.
Problem 15.3a
Fill in the blanks: In an olfactory neuron, the binding of a(n) ______to its membrane receptor triggers a(n)_______potential in the axons of the______nerve.
Problem 15.3a
If a patient suffers visual impairment only in one eye, why must the damage be located in the visual pathway prior to the optic chiasma?
Problem 15.3a
If severe congestion from a cold prevented your pharyngotympanic tube from opening, what could happen to your tympanic membrane? Explain your answer.
Problem 15.4a
The primary olfactory cortex is located in the:
a. frontal lobe.
b. occipital lobe.
c. parietal lobe.
d. temporal lobe.
