Question

hearing
within the cochlear duct, the endolymph - containing membranous labyrinth of the ( 1 ) is the spiral organ of cort (korto), which contains the hearing receptors, or hair cells (figure 8.14a). the chambers (scalae) above and below the cochlear duct contain perilymph. sound waves that reach the cochlea through vibrations of the eardrum, ossicles, and oval window set the cochlear fluids into motion (figure 8.15). as the sound waves are ( 2 ) by the ossicles from the eardrum to the oval window, their force (amplitude) is increased by the lever activity of the ossicles. in this way, nearly the total force exerted on the much larger eardrum reaches the tiny oval window, which in turn sets the fluids of the inner ear into motion, and these pressure waves set up ( 3 ) in the basilar membrane. the receptor cells, positioned on the basilar membrane in the spiral organ of cort, are stimulated by the vibrating movement of the basilar membrane against the gel - like tectorial (tok - tore - al) membrane that lies over them. the hairs of the receptor cells are embedded in the stationary tectorial membrane such that when the basilar ( 4 ) vibrates against it, the hairs bend (see figure 8.14b). the length of the fibers spanning the basilar membrane tunes specific regions to vibrate at specific frequencies. in general, high - pitched sounds disturb the shorter, stiffer fibers of the basilar membrane and stimulate receptor cells close to the oval window, whereas low - pitched sounds affect longer, more floppy fibers and activate specific ( 5 ) cells further along the cochlea

1. vibrations 2. membrane 3. hair 4. cochlea 5. transmitted
2. hair 2. cochlea 3. transmitted 4. vibrations 5. membrane
3. membrane 2. hair 3. cochlea 4. transmitted 5. vibrations
4. transmitted 2. vibrations 3. membrane 4. hair 5. cochlea
5. cochlea 2. transmitted 3. vibrations 4. membrane 5. hair

Explanation:

1. The cochlea is the structure within the cochlear duct that contains the spiral organ of Corti.
2. Sound waves are transmitted from the eardrum to the oval window by the ossicles.
3. Pressure waves set up vibrations in the basilar membrane.
4. The basilar membrane vibrates against the tectorial membrane.
5. High - pitched sounds affect shorter fibers near the oval window, and low - pitched sounds activate specific hair cells further along the cochlea.

Answer:

1. cochlea 2. transmitted 3. vibrations 4. membrane 5. hair