L8 Cellular Transport
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Questions and Answers

What is the main characteristic of facilitated diffusion?

  • Molecules move through pores in channel proteins (correct)
  • Carrier proteins change shape
  • Moves molecules from low to high concentration
  • Requires energy or ATP
  • How do carrier proteins assist in moving molecules across the cell membrane?

  • Undergoing conformational changes
  • Extending through the membrane
  • Creating a membrane potential
  • Bonding, dragging molecules through the lipid bilayer, and releasing them on the opposite side (correct)
  • Which type of transport requires energy or ATP?

  • Secondary active transport
  • Facilitated diffusion
  • Symport
  • Primary active transport (correct)
  • What is the function of the sodium-potassium pump?

    <p>Transporting 3 Na+ out for every 2 K+ pumped in</p> Signup and view all the answers

    In primary active transport, where does the energy come from for the functions of carrier proteins?

    <p>Hydrolysis of ATP</p> Signup and view all the answers

    What is the term used for coupled transport when another molecule is moved in the same direction as Na+?

    <p>'Cotransport'</p> Signup and view all the answers

    What process is involved in the correction of YD's hyperkalemia during dialysis?

    <p>Passive diffusion</p> Signup and view all the answers

    Which compartment had the higher concentration of potassium in YD's case?

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

    What is the purpose of the semipermeable membrane in the hemodialysis filter?

    <p>To allow passive diffusion</p> Signup and view all the answers

    How did the concentration gradient help correct YD's hyperkalemia?

    <p>By causing potassium to move from blood to dialysate</p> Signup and view all the answers

    Which fluid had a lower potassium concentration in YD's case?

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

    What drives the force of diffusion during simple diffusion?

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

    Which molecule can easily pass through the cell membrane via simple diffusion?

    <p>$O_2$</p> Signup and view all the answers

    In which solution is there no net movement of water molecules?

    <p>Isotonic solution</p> Signup and view all the answers

    What is the main characteristic of facilitated diffusion?

    <p>Uses transport proteins</p> Signup and view all the answers

    What is the driving factor for osmosis?

    <p>Difference in water potential</p> Signup and view all the answers

    What type of molecules are typically impermeable to the cell membrane in simple diffusion?

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

    What is the primary function of homeostasis?

    <p>To maintain a stable internal environment</p> Signup and view all the answers

    Which of the following is NOT a factor that affects the rate of diffusion?

    <p>Electrical charge of the molecules</p> Signup and view all the answers

    What is the process called when water molecules move from a region of higher water concentration to a region of lower water concentration across a selectively permeable membrane?

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

    Which of the following transport mechanisms requires the direct expenditure of energy by the cell?

    <p>Active transport</p> Signup and view all the answers

    In the clinical case presented, what process was involved in the correction of the patient's hyperkalemia during hemodialysis?

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

    Which of the following processes involves the formation of vesicles from the cell membrane?

    <p>Both exocytosis and endocytosis</p> Signup and view all the answers

    What process is involved when a molecule or ion moves in the opposite direction to Na+ (out of the cell)?

    <p>Countertransport (Antiport)</p> Signup and view all the answers

    Which process involves the movement of large molecules out of the cell through vesicles fusing with the plasma membrane?

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

    In which process does the cell form an invagination to take in dissolved molecules?

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

    Which process is used by cells to engulf large particles such as food or bacteria?

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

    In which process do integral proteins with receptors on their surface recognize and take in hormones or cholesterol?

    <p>Receptor-mediated endocytosis</p> Signup and view all the answers

    What condition is the patient YD, a 62-year-old woman with type 2 diabetes mellitus, likely suffering from?

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

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