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Questions and Answers
What is the primary function of active transport in cellular membranes?
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?
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?
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?
Which process would most likely be altered by physiological changes or hormonal processes?
What is necessary for ATPase-dependent ion pumps to function?
What is necessary for ATPase-dependent ion pumps to function?
Flashcards
Active Transport
Active Transport
Movement of ions across a cell membrane using energy from ATP, often with the help of ion pumps.
Passive Transport
Passive Transport
Movement of ions across a cell membrane without using energy, driven by concentration differences.
Diffusion
Diffusion
The process by which ions move from a region of high concentration to a region of low concentration.
Ion Pumps
Ion Pumps
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Homeostasis
Homeostasis
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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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