You Perform a Series of Voltage-Clamp Experiments with 2 MM

question 37

Multiple Choice

You perform a series of voltage-clamp experiments with 2 mM extracellular calcium, 0.2 mM extracellular calcium and 0 mM extracellular calcium. You notice that the potassium current increases with each step. What is the origin of this increase?

• A) Decreased membrane potential
• B) Increased threshold potential
• C) Activation of calcium-activated sodium channels
• D) Activation of calcium-activated potassium channels
• E) Activation of calcium channels

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Definitions:

Perpetuity

An annuity that pays a constant stream of cash flows indefinitely.

Duration

An indicator of how a bond or debt security's price is affected by interest rate fluctuations, usually stated in terms of years.

Yield

The income return on an investment, such as the interest or dividends received, expressed as a percentage of the investment's cost or current market value.

Convexity

A gauge of how changes in interest rates affect the relationship between the price of bonds and their yields, showing alterations in the bond's duration.