Diffusion and Osmosis Flashcards
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Questions and Answers

What is diffusion?

  • The process of water moving through a membrane
  • The movement of particles from an area of high concentration to an area of low concentration (correct)
  • The process of molecules shriveling up
  • A type of active transport
  • What is osmosis?

  • The movement of water through a semi-permeable membrane (correct)
  • The movement of particles without energy
  • The process of particles moving with energy
  • The process of diffusion
  • What happens to your fingers after sitting in the bathtub for hours?

    They start to look like prunes

    What is the primary function of a phospholipid bilayer?

    <p>To form the cell membrane</p> Signup and view all the answers

    The cell membrane is ____ permeable.

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

    What does 'semi-permeable' mean?

    <p>Chooses what enters and exits the cell</p> Signup and view all the answers

    Diffusion causes particles to move from ____ to ____ concentration.

    <p>high; low</p> Signup and view all the answers

    Does a cell use energy when molecules diffuse in or out of the cell down the concentration gradient?

    <p>No</p> Signup and view all the answers

    _____ requires energy to transport molecules against a concentration gradient.

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

    In ____ and ______ no energy is used.

    <p>osmosis; diffusion</p> Signup and view all the answers

    What needs a helper to get things across?

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

    What does concentration refer to?

    <p>Amount of a substance in a certain place</p> Signup and view all the answers

    What does diffusion do?

    <p>Moves particles like oxygen into cells</p> Signup and view all the answers

    What does osmosis do?

    <p>Moves water in and out of cells</p> Signup and view all the answers

    What type of membrane allows some substances through?

    <p>Selectively permeable membrane</p> Signup and view all the answers

    Study Notes

    Diffusion

    • Process where particles move from an area of high concentration to an area of low concentration.
    • Examples include odors traveling in the air and oxygen diffusing from lungs into the blood.
    • Occurs without the use of energy, following the concentration gradient.

    Osmosis

    • Special case of diffusion focused on water molecules.
    • Water moves across a semi-permeable membrane from an area of lower solute concentration to higher solute concentration.
    • Examples include the wrinkling of fingers after prolonged water exposure and the effects of salt on slugs and swollen throat cells.

    Phospholipid Bilayer

    • The fundamental structure of the cell membrane, composed of two layers of phospholipids.
    • Functions as a barrier to control substance entry and exit.

    Semi-permeable Membrane

    • Cell membranes are selectively permeable, allowing certain substances to pass while blocking others.
    • This characteristic is vital for maintaining cellular homeostasis.

    Concentration Gradient

    • Diffusion is guided by the concentration gradient, moving from areas of high concentration to low concentration.
    • Facilitated diffusion also applies to particles needing assistance for transport across the membrane.

    Active Transport

    • Requires energy to move molecules against their concentration gradient.
    • Critical for maintaining necessary concentrations of ions and nutrients within cells.

    Key Definitions

    • Facilitated Diffusion: Requires assistance (like transport proteins) to move substances across the membrane.
    • Concentration: Refers to the amount of a substance within a given area.

    Functions

    • Diffusion: Essential for moving critical substances, such as oxygen, into cells.
    • Osmosis: Vital for regulating water levels and maintaining cell integrity.

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    Test your understanding of diffusion and osmosis with these flashcards designed to illustrate key concepts through relatable scenarios. Each card presents a term followed by a definition that connects the scientific principle to everyday experiences.

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