Cell Transport Mechanisms Quiz
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Questions and Answers

What is the average size range of a single cell?

  • 15 to 20 micrometers
  • 20 to 25 micrometers
  • 5 to 10 micrometers
  • 10 to 15 micrometers (correct)

    • Which type of cell can have extensions up to a meter in length?

  • Nerve cells (correct)
  • Blood cells
  • Skin cells
  • Muscle cells

    • What important function of cells involves the synthesis of proteins, nucleic acids, and lipids?

  • Synthesis of molecules (correct)
  • Cell metabolism and energy use
  • Cell division
  • Cell communication

    • Which process provides energy for muscle contraction and heat production within cells?

    <p>Cell metabolism</p> Signup and view all the answers

    What allows nerve cells to communicate with muscle cells and cause muscle contraction?

    <p>Cell communication</p> Signup and view all the answers

    Which statement best describes how the structural and functional characteristics of cells are determined?

    <p>By the types of molecules they produce</p> Signup and view all the answers

    What is the function of a solute in a fluid?

    <p>Substance that is being dissolved in the fluid</p> Signup and view all the answers

    Where can glycogen, potassium ions, and enzymes be found?

    <p>Intracellular fluid</p> Signup and view all the answers

    Which process does not require cellular energy for transport?

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

    Where can interstitial fluids be found?

    <p>Between cells within tissues</p> Signup and view all the answers

    What is the function of a solvent in a fluid?

    <p>Fluid in which solute is being dissolved</p> Signup and view all the answers

    What is the unique capability of cell membranes regarding substance passage?

    <p>They only allow certain substances to pass through</p> Signup and view all the answers

    What is the driving force for the diffusion process to occur?

    <p>High concentration gradient</p> Signup and view all the answers

    Which substances can easily pass through the phospholipid bilayer of the cell membrane?

    <p>Lipid-soluble substances like oxygen</p> Signup and view all the answers

    How do sodium and potassium primarily enter the cell membrane?

    <p>Through leak channels</p> Signup and view all the answers

    Which type of channels constantly allow ions to pass through?

    <p>Leak channels</p> Signup and view all the answers

    What is a characteristic of gated channels in the cell membrane?

    <p>Open and close to limit ion movement</p> Signup and view all the answers

    In the body, diffusion is an important means of transporting substances through which fluids?

    <p>Intracellular and extracellular fluids</p> Signup and view all the answers

    What is the main difference between diffusion and osmosis?

    <p>Diffusion can happen against the concentration gradient, while osmosis always occurs down the concentration gradient.</p> Signup and view all the answers

    Why is osmosis important to cells?

    <p>It prevents disruptions in normal cell functions caused by water movements.</p> Signup and view all the answers

    How does a decrease in extracellular oxygen concentration affect cell function?

    <p>It reduces the diffusion of oxygen into the cell, affecting normal cell function.</p> Signup and view all the answers

    In osmosis, which solution will water move towards?

    <p>The solution with lower water concentration.</p> Signup and view all the answers

    Why does diffusion play a crucial role in determining intracellular concentrations of substances?

    <p>Because diffusion helps substances move based on the concentration gradient.</p> Signup and view all the answers

    What factor determines the direction of water movement across a cell membrane?

    <p>Solute concentration on either side of the membrane.</p> Signup and view all the answers

    What is active transport?

    <p>The movement of substances across a membrane using energy from lower concentration to higher concentration</p> Signup and view all the answers

    Which statement accurately describes the role of ATP in active transport?

    <p>ATP provides the energy needed for active transport</p> Signup and view all the answers

    What can happen if there is a malfunction in the active transport mechanism?

    <p>It can lead to serious health conditions</p> Signup and view all the answers

    What is an example of active transport mentioned in the text?

    <p>Movement of amino acids from the small intestine into the blood</p> Signup and view all the answers

    How does the sodium-potassium pump function?

    <p>By moving Na+ into cells and K+ out of cells</p> Signup and view all the answers

    What is essential in maintaining the resting membrane potential?

    <p>Higher concentration of Na+ outside the cell and K+ inside the cell</p> Signup and view all the answers

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