C. Hearing (True-False) 1. Sound waves may reach the cochlea through the skull bones as well as via the tympanic membrane. 2. The more hair cells sending impulses, the louder will be the sound sensation. 3. Pitch is determined by the part of the basilar membrane that is activated. 4. Bending of the hair cells causes the formation of impulses. 5. There is no cure for conduction deafness, but nerve deafness may often be corrected. D. Equilibrium Select the structures described by the statements below. ampulla otoliths crista ampullaris saccule macula utricle 1. Two portions of the membranous labyrinth containing sensory receptors for static equilibrium. 2. Sensory hair cells in ampullae of semicircular canals. 3. Hair cells stimulated by the movement of the otoliths. 4. Hair cells stimulated by the force of endolymph. 5. Sensory receptors for dynamic equilibrium. 6. Enlarged base of a semicircular canal. 7. Calcium carbonate crystals. E. Hearing Tests Record your results of the hearing tests. Rinne Test Left ear Right ear
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20. Which is FALSE about efferent connections in the cochlea? a. They mostly contact inner hair cells. b. They mostly contact outer hair cells. c. They contact a diffuse number of outer hair cells. d. They can cause outer hair cells to change length. e. All of the above are TRUE. 21. Which of the following is/are FALSE? a. "Sound waves" are made of compressions and rarefactions. b. Sound intensities between 65 and 120 dB are considered painful. c. Room noise ~ 40-50 dB. d. Complex sounds are made up of pure tones. e. None of the above. 22. About how many Afferents (not Efferents) contact a given inner hair cell (not an outer hair cell)? a. 1 b. 10 c. 100 d. 1,000 e. 3,000 23. Speech sounds are mostly in what frequency range? a. 20 – 20,000 Hz b. 0 – 120 Hz c. 1000 – 6000 Hz d. 1000 – 20,000 Hz e. 40 – 50 Hz 24. Which is/are TRUE? a. Auditory tuning curves are similar to receptive fields that we discussed for touch and vision, except auditory tuning curves are based on frequency, not a map of spatial locations (like in vision and touch). b. Hair cells and auditory nerve fibers have "V" shaped tuning curves. c. Auditory tuning curves are broad in the superior colliculus (the nucleus that guides orientation reflexes) and narrow in the inferior colliculus (the nucleus that processes the meaning of sounds). d. All of the above are True. e. None of the above are True.
Sri K.
1. Select all that apply: Which of the following statements are true about frequency tuning in the cochlea? Group of answer choices A. Organs of corti near the apex of the cochlea detect low frequency sound waves B. Organs of corti near the base of the cochlea detect low frequency sound waves C. Organs of corti near the base of the cochlea detect high frequency sound waves D. Organs of corti near the apex of the cochlea detect high frequency sound waves 2. The cochlea could still produce an action potential without stereocilia hairs without any assistance from an external device. True or False
Adi S.
This is a list of some of the steps in the process of hearing a sound. Put them in cause-and-effect order from first to last. A. K+ channels in the hair cell membranes open B. The incus (ear bone) vibrates C. The hair cell releases neurotransmitter D. Pressure waves pass through the air in the ear canal E. Afferent neurons transmit action potentials through the cochlear nerve F. The hair cell membrane is depolarized G. Pressure waves travel through the fluid in the cochlea H. The tympanic membrane vibrates I. Voltage-gated Ca2+ channels open J. The stapes (ear bone) vibrates K. Stereocilia in hair cells deflect (bend) L. The malleus (ear bone) vibrates M. The oval window vibrates
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