A Recording Electrode Is Placed into a Nerve Cell to Measure

question 462

Multiple Choice

A recording electrode is placed into a nerve cell to measure the membrane potential at a particular point.When the physiologist glances at the recording and sees that the membrane at that instant has a potential of +15 mV, she knows that the portion of the membrane being recorded is which of the following

• A)in the normal resting state
• B)in the reversal phase of an action potential
• C)more permeable to Ca²⁺ than normal
• D)in the after hyperpolarization phase of an action potential

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Definitions:

Mass

An assessment of how much matter an object holds, often measured in grams or kilograms.

Density

The mass per unit volume of a substance, commonly expressed in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³).

Volume

The amount of space that a substance or object occupies, or that is enclosed within a container, typically measured in cubic units.

Mass

A measure of the amount of matter in an object, a fundamental property that affects the object's inertia and gravitational interaction.