Membrane Permeability and Transport Mechanisms
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Questions and Answers

Which of the following is NOT a role of transport processes in cellular physiology?

  • Control of DNA transcription (correct)
  • The extrusion of waste products of metabolism and toxic substances
  • Regulation of cell volume
  • Maintenance of intracellular pH

    • What is the main aim of the lecture on membrane permeability?

  • To consider the role of membranes as permeability barriers to small hydrophilic molecules
  • To introduce the major transport mechanisms that contribute to the generation of ion gradients across cell membranes
  • To discuss the concentration of metabolic fuels and building blocks
  • To explore the protein-mediated mechanisms that allow the uptake or extrusion of specific water-soluble molecules and ions (correct)

    • What is the main difference in the concentrations of sodium and potassium between the extracellular fluid (ECF) and intracellular fluid (ICF)?

  • Greater sodium level in ECF, greater potassium level in ICF (correct)
  • Greater potassium level in ECF, greater sodium level in ICF
  • Small amount of sodium in ECF, large amount of potassium in ICF
  • Equal levels of sodium and potassium in both ECF and ICF

    • Which of the following is NOT a function of membranes as permeability barriers?

    <p>Synthesis of metabolic fuels and building blocks</p> Signup and view all the answers

    What is the primary role of the major transport mechanisms introduced in the lecture?

    <p>To contribute to the generation of ion gradients across cell membranes</p> Signup and view all the answers

    Which transport process is crucial for the electrical excitability of nerve and muscle?

    <p>Maintenance of ionic composition</p> Signup and view all the answers

    What is the primary function of membranes as permeability barriers?

    <p>Regulating ionic composition</p> Signup and view all the answers

    What is the major difference in the concentrations of potassium between the extracellular fluid (ECF) and intracellular fluid (ICF)?

    <p>Lower in ECF than ICF</p> Signup and view all the answers

    Which fluid has a large amount of sodium and chloride according to the lecture?

    <p>Extracellular fluid (ECF)</p> Signup and view all the answers

    What is the main aim of the lecture on membrane permeability?

    <p>To consider the role of membranes as permeability barriers</p> Signup and view all the answers

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