Ion Concentration Regulation Quiz

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Questions and Answers

What is the role of active transport in cellular ion concentration maintenance?

It relies solely on diffusion for ion movement.
It requires no energy to function.
It allows for the free passage of all ions without restriction.
It requires energy to move ions against their concentration gradient. (correct)

Which of the following factors influence the rate of diffusion for ions?

The concentration of ATP available in the cell.
The size and charge of the ion, as well as membrane characteristics. (correct)
The presence of hormones only.
The temperature of the environment alone.

Which ions are typically maintained at a high concentration intracellularly and extracellularly?

Chloride ions inside and potassium ions outside.
Calcium ions inside and sodium ions outside.
Sodium ions inside and calcium ions outside.
Potassium ions inside and sodium ions outside. (correct)

What differentiates passive transport from active transport in ion movement?

<p>Passive transport relies on concentration gradients while active transport does not. (A)</p> Signup and view all the answers

Which statement regarding ATPase-dependent ion pumps is true?

<p>They require ATP to transport ions against their electrochemical gradients. (D)</p> Signup and view all the answers

Flashcards

Diffusion (Passive Transport)

Movement of ions across a membrane without requiring energy. It depends on factors like ion size, charge, and membrane characteristics.

Active Transport

Movement of ions across a membrane that requires energy. It often uses ATP to move ions against their concentration gradients.

ATPase-dependent Ion Pumps

A type of active transport that uses energy from ATP to move ions across membranes. They maintain specific ion concentrations inside and outside cells.

Ion Concentration Gradient

The difference in concentration of a particular ion between the inside and outside of a cell.

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Factors Affecting Diffusion

Physiological and hormonal processes that can influence the rate of diffusion of ions.

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Study Notes

Ion Concentration Regulation

Cellular and plasma ion concentrations are regulated by active and passive transport.
Active transport requires energy to move ions against their concentration gradients.
Example of active transport: Maintaining high intracellular potassium (K+) and high extracellular sodium (Na+) levels uses energy from ATP via ATPase pumps.
Passive transport (diffusion) is the movement of ions along their concentration gradients.
Factors affecting diffusion rate: size and charge of the ion, and membrane properties.
Physiological and hormonal processes can influence ion diffusion rates.