Which Statement Is Not True

question 143

Multiple Choice

Which statement is not true?

• A) The transmembrane potential of a rod cell becomes more negative when the rod cell is exposed to light.
• B) A photoreceptor releases the most neurotransmitter when in total darkness.
• C) Whereas in vision the intensity of a stimulus is encoded by the degree of hyperpolarization of photoreceptors, in hearing the intensity of a stimulus is encoded by changes in firing rates of sensory neurons.
• D) Stiffening of the ossicles in the middle ear can lead to deafness.
• E) The interaction among hammer (malleus), anvil (incus), and stirrup (stapes) conducts sound waves across the fluid-filled middle ear.

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Definitions:

REM Sleep

A unique phase of sleep characterized by rapid eye movement, increased brain activity, vivid dreams, and temporary paralysis of the muscles.

N1 Sleep

N1 sleep, or the first stage of non-REM sleep, is a transitional phase where one drifts in and out of sleep and can be easily awakened.

N2 Sleep

A stage of sleep characterized by sleep spindles and K-complexes, representing a deeper sleep than N1 and preceding the deeper N3 stage of sleep.

N3 Sleep

The third stage of non-REM sleep, characterized by deep sleep and the lowest levels of physiological activity within the sleep cycle.