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Exploring Cell Movements: Diffusion, Transport, and Osmosis

Understand how cells move through diffusion, active transport, phagocytosis, exocytosis, and osmosis. Learn about osmolarity and its impact on red blood cells' shapes. Explore real-life examples and the importance of tonicity.

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Exploring Cell Movements: Diffusion, Transport, and Osmosis

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  1. The Life of the Cell Chapter 3

  2. Types of Movements • 1. Diffusion and passive transport • 2. Active Transport • 3. Phagocytosis & Exocytosis • 4. Osmosis

  3. 1. solution

  4. Passive Transport [High] [Low] Nucleus Note: Solutes move

  5. 2. Active Transport: may be ions (e.g. Na+, K+ or other molecules like glucose). • Requires Energy • Requires a Transporter

  6. Movement of large molecules: requires energy also 3. Exocytosis Endocytosis and Phagocytosis http://www.macroevolution.net/images/exocytosis-stanford-sea-urchin.gif

  7. 4. Osmosis is : the movement of WATER from a region of HIGHER WATER concentration to region of LOWER WATER concentration across a semi-permeable membrane.

  8. Now: A real life example of how osmosis is important to the human red blood cells. It is helpful to understand the term of “osmolarity”.

  9. Osmolarity (FYI) • Osmolarity is the measure of solute concentration, defined as the number of osmoles(Osm) of solute per liter(L) of solution (osmol/L or Osm/L). • 1 mol/L NaCl corresponds to an osmolarity of 2 osmol/L each mole of NaCl becomes two osmoles in solution, one mole of Na+ and one mole of Cl-. • Similarly, a solution of 1 mol/L CaCl2, gives a solution of 3 osmol/L (Ca2+ and 2 Cl-).

  10. What happens to the shapes of the RBC? No change Swelling Crenation 600 mOsm 300 mOsm 200 mOsm

  11. Red Blood Cells and the affect of Tonicity 100 200 300 400 500 milliosmosmoles

  12. We will next discuss our digestive system

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