Which of the Following Is a Common Means by Which

question 400

Multiple Choice

Which of the following is a common means by which binding of an extracellular chemical messenger with a cell's receptor brings about a desired intracellular response

• A)opening or closing of specific channels to regulate ionic movement across the plasma membrane
• B)activation of an extracellular, second messenger system
• C)alteration of DNA structure by attaching to the nucleus
• D)combination with surface receptor

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Definitions:

Vestibule

An entrance or enclosed antechamber to a larger space or structure, like the entrance to the inner ear or to a building.

Cochlear Duct

A spiral-shaped cavity within the cochlea of the inner ear, playing a critical role in converting sound vibrations into neural signals.

Oval Window

The membrane-covered opening between the middle ear and the inner ear, transmitting sound vibrations to the cochlea.

Scala Vestibuli

Division of the cochlea lying above the spiral lamina and vestibular membrane.