Podcast
Questions and Answers
What does active transport require in order to move ions across cellular membranes?
What does active transport require in order to move ions across cellular membranes?
- Concentration gradient
- Energy from ATP (correct)
- Membrane permeability
- Ion size and charge
Which ion concentration is typically higher inside the cell compared to outside in the plasma?
Which ion concentration is typically higher inside the cell compared to outside in the plasma?
- Cl
- Ca
- K (correct)
- Na
What primarily influences the rate of diffusion of ions across a membrane?
What primarily influences the rate of diffusion of ions across a membrane?
- The temperature of the solution
- The ion's size and charge, along with membrane characteristics (correct)
- The electrical potential difference
- The ion's molecular weight
How does passive transport differ from active transport?
How does passive transport differ from active transport?
Which mechanism would be used to maintain Na concentration outside the cell?
Which mechanism would be used to maintain Na concentration outside the cell?
Flashcards
Active transport
Active transport
The movement of ions across a cell membrane that requires energy, often from ATP.
Passive transport
Passive transport
The movement of ions across a cell membrane that does not require energy.
Diffusion
Diffusion
A type of passive transport where ions move from an area of high concentration to an area of low concentration.
Ion pump
Ion pump
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Ion homeostasis
Ion homeostasis
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Study Notes
Ion Concentration Maintenance
- Cellular and plasma ion concentrations are regulated by active and passive transport.
- Active transport requires energy to move ions across cell membranes.
- An example is maintaining high intracellular potassium (K+) and high extracellular (plasma) sodium (Na+) concentrations. This process uses energy from ATP, via ATPase-dependent ion pumps.
- Diffusion is a passive ion transport mechanism.
- The rate of diffusion depends on the ion's size and charge, and the membrane characteristics.
- Physiological and hormonal processes can affect ion diffusion rates.
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Description
This quiz covers the principles of ion concentration maintenance in cells, focusing on active and passive transport mechanisms. Learn how energy is utilized to regulate intracellular and extracellular ion levels, and the factors influencing ion diffusion. Test your understanding of physiological and hormonal impacts on these processes.
