Which of the Following Is True About the Movement of Ions

question 53

Multiple Choice

Which of the following is true about the movement of ions across excitable living membranes?

• A) Ions always move actively across membranes through leakage channels.
• B) Ions always move from an area of higher concentration to an area of lower concentration
• C) Sodium gates in the membrane can open in response to electrical potential changes.
• D) Ions always move passively across membranes.

Distinguish between short-run and long-run production periods and associated cost behaviors.

Apply the concept of minimum efficient scale in the context of firm size and cost management.

Identify the factors contributing to economies of scale and how they affect firm production and costs.

Analyze the operational and managerial challenges leading to diseconomies of scale.

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Definitions:

Positive Pole

In electrical terminology, the terminal of a battery or device from which current flows out, having a higher electrical potential.

Muscle End Plate

A specialized area of muscle fiber membrane where a motor neuron terminates and transmits nerve impulses to the muscle, leading to contraction.

Neurotransmitter-activated Ion Channels

Ion channels that open in response to the binding of a neurotransmitter, allowing ions to enter or exit the neuron and alter its electrical charge.