Cell Membrane Transport Notes Cell Membrane Definition The

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Cell Membrane Transport Notes

Cell Membrane Transport Notes

Cell Membrane • Definition: The semi-permeable outercovering of all cells. • Composition: – 2

Cell Membrane • Definition: The semi-permeable outercovering of all cells. • Composition: – 2 Phospholipid Layers – Protein Channels embedded • Purpose / Function: – Control traffic in and out of the cell – Protection

Cell Wall • Definition: The rigid outer-covering of plant, and some bacterial cells. •

Cell Wall • Definition: The rigid outer-covering of plant, and some bacterial cells. • Composition: – Cellulose (Plants) – Chitin (Fungi) – Peptidoglycan (Bacteria) • Purpose / Function: – Extra Support & Structure – Extra Protection

Cell Membrane Transport • Methods: – Diffusion (No energy needed) – Osmosis (No energy

Cell Membrane Transport • Methods: – Diffusion (No energy needed) – Osmosis (No energy needed) – Active Transport (Energy needed) • “Transport” = Things moving in and out of the cell.

Concentration • Definition: The amount of matter in a given amount of space (area).

Concentration • Definition: The amount of matter in a given amount of space (area). • High Concentration = More matter in a given amount of space. • Low Concentration = Less matter in a given amount of space. • “Concentration Gradient”: A difference in concentrations.

Permeability • Definition: The ability of matter to move across a boundary. • Cell

Permeability • Definition: The ability of matter to move across a boundary. • Cell Membranes are Semi-Permeable. • “Semi-Permeable”: The ability of only certain types of matter to move across a boundary.

Fully Permeable Not Permeable Semi- Permeable

Fully Permeable Not Permeable Semi- Permeable

Equilibrium • Definition: State of balance. • Matter moves in and out of cells

Equilibrium • Definition: State of balance. • Matter moves in and out of cells to reach equilibrium.

Diffusion • Definition: The movement of particles across a concentration gradient, from an area

Diffusion • Definition: The movement of particles across a concentration gradient, from an area of higher concentration, to an area of lower concentration.

Osmosis • Definition: The movement of water particles, across a concentration gradient, from an

Osmosis • Definition: The movement of water particles, across a concentration gradient, from an area of higher water concentration, to an area of lower water concentration. • *Water concentration with respect to Solute concentration!

Solute & Solvent • Solute: Solid particles – Sugar – Salt • Solvent: Liquid

Solute & Solvent • Solute: Solid particles – Sugar – Salt • Solvent: Liquid which dissolves solute. – Water