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Ion Concentration Maintenance

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Questions and Answers

What is the primary function of active transport in cellular membranes?

To promote the diffusion of ions

To maintain equilibrium between extracellular and intracellular ions

To facilitate the passive movement of molecules

To move ions against their concentration gradient (correct)

Which ion is mentioned as being maintained at a high concentration inside the cell through energy-consuming processes?

Potassium (K+) (correct)

Chloride (Cl-)

Calcium (Ca2+)

Sodium (Na+)

What is a characteristic of diffusion as described in the content?

It occurs only with charged ions.

It requires energy from ATP.

It is influenced by the size and charge of ions. (correct)

It is always a rapid process.

Which process would most likely be altered by physiological changes or hormonal processes?

<p>Diffusion</p> Signup and view all the answers

What is necessary for ATPase-dependent ion pumps to function?

<p>Energy from ATP</p> Signup and view all the answers

Study Notes

Ion Concentration Maintenance

Cellular and plasma ion concentrations are regulated by active and passive transport.
Active transport uses energy (ATP) to move ions across cell membranes.
This process is exemplified by maintaining high intracellular potassium (K+) and high extracellular (plasma) sodium (Na+) levels. ATPase-dependent ion pumps use ATP energy in this process.
Diffusion is the passive movement of ions across a membrane. Mobility depends on ion size, charge, and membrane properties.
Physiological and hormonal processes can affect the rate of ion diffusion.

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Description

This quiz covers the mechanisms of ion concentration maintenance in cells, focusing on the roles of active and passive transport. Key processes like ATP-dependent ion pumps and diffusion are discussed, including their physiological implications. Explore how hormonal factors can influence ion movement across membranes.