Neuron Cells Generate Electrical Signals by Concentration Gradients Across Membranes

question 25

Multiple Choice

Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a potassium ion concentration of 0.003 M inside the cell, and a concentration of 0.135 M outside the cell, what is the electrical potential across the cell membrane? Body temperature is 310 K. The sign identifies the change in the electrical potential across the membrane and which way the ions flow.

• A) +204 mV
• B) +102 mV
• C) +10.0 mV
• D) -204 mV
• E) -136 mV

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Definitions:

Financial Break-Even

The point at which total revenues equal total costs and expenses, leaving no net profit or loss.

Initial Investment

The amount of money used to start a project, purchase an asset, or invest in a business venture for the first time.

Depreciation

The accounting method of allocating the cost of a tangible asset over its useful life.

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A measure of how sensitive a company's operating income is to changes in revenue.