DQuestion 1 2 pts As a sound wave enters the ear, which of the following structu
ID: 3510906 • Letter: D
Question
DQuestion 1 2 pts As a sound wave enters the ear, which of the following structures does it interact with first? Oval window Malleus Incus Stapes Tympanic membrane uestion2 2 pts During excitation of a hair cell: The action potential amplitude (height) is increased in the auditory nerve. Cation entry through stretch-gated channels depolarizes the cell and results in elevated neurotransmitter release. Stretch-gated channels close and the cell hyperpolarizes Anion entry depolarizes the cell Stereocilia are bent towards the shortest stereocilium.Explanation / Answer
QUESTION 1
AS SOUND WAVE ENTERS THE EAR THE STRUCTURE WHICH INTERACTS FIRST - TYMPANIC MEMBRANE
DURING EXCITATION OF A HAIR CELL-CATION ENTRY THROUGH STRETCH-GATED CHANNELS DEPOLARIZES THE CELL AND RESULTS IN ELEVATED NEUROTRANSMITTER RELEASE
As sound waves propagate in the cochlea, the movement of endolymph fluid bends the stereocilia
If the direction of movement is towards the taller stereocilia, tension develops , mechanically opening transduction channels near the tips.
Cations from the endolymph flow into the cell, depolarizing the hair cell and triggering the release of neurotransmitters to nearby nerves, which send an electrical signal to the central nervous system
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