Hair cells baseline membrane potential O?
**Core Concept:**
Hair cells are specialized sensory neurons located in the cochlea of the inner ear, responsible for detecting sound and converting it into electrical signals. They have a unique structure with hair-like stereocilia that rise and fall in response to mechanical stimuli. The resting membrane potential of hair cells is crucial for their function as it determines the sensitivity and response characteristics.
**Why the Correct Answer is Right:**
The correct answer, **D**, refers to the resting membrane potential of hair cells in the cochlea, which is around -90 millivolts (mV). This value is important as it sets the baseline potential for the hair cells to function optimally. A proper resting membrane potential allows hair cells to respond to mechanical stimuli and convert them into electrical signals, enabling the process of hearing.
**Why Each Wrong Option is Incorrect:**
Option A is incorrect because the baseline membrane potential is not -100 mV, which would make the hair cells too hyperpolarized and less sensitive to mechanical stimuli.
Option B is incorrect because the baseline membrane potential is not -70 mV, making the hair cells more depolarized and reducing their sensitivity.
Option C is incorrect for the same reason as Option A, as the baseline membrane potential should be close to -90 mV to ensure proper function of hair cells.
**Why Each Wrong Option is Incorrect:**
Option A is incorrect because the baseline membrane potential is not -100 mV, which would make the hair cells too hyperpolarized and less sensitive to mechanical stimuli.
Option B is incorrect because the baseline membrane potential is not -70 mV, making the hair cells more depolarized and reducing their sensitivity.
Option C is incorrect for the same reason as Option A, as the baseline membrane potential should be close to -90 mV to ensure proper function of hair cells.
**Clinical Pearls:**
The correct answer demonstrates the importance of maintaining a specific resting membrane potential in hair cells to ensure optimal function in detecting mechanical stimuli, thus facilitating the process of hearing. An understanding of this concept is crucial for medical students and future healthcare professionals, particularly those involved in audiology and otolaryngology.