The Cell Membrane Pages 60-61. The Cell Membrane.

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Presentation transcript:

The Cell Membrane Pages 60-61

The Cell Membrane

Vocabulary Phospholipid = lipid made of a phosphate group and two fatty acids

Vocabulary Polar = Hydrophilic, or "water-loving” – Soluble in water Nonpolar = Hydrophobic, or “water-fearing” – NOT soluble in water

Vocabulary Lipid bilayer = the basic structure of a membrane, composed of two layers of phospholipids

Passive Transport Passive transport = movement across the cell membrane that DOES NOT require energy – Examples = Diffusion and Osmosis

Passive Transport - Diffusion Diffusion = the movement of a substance from an area of HIGH concentration to LOW concentration. Note: the symbol for concentration is [ ].

Passive Transport - Diffusion Equilibrium = [ ] of a substance is EQUAL throughout a space

Passive Transport - Osmosis Osmosis = the diffusion of water across a semi-permeable membrane

Passive Transport - Osmosis 3 possibilities for direction of H 2 O movement: – Hypertonic solution = water moves OUT High [solute] in solution – Hypotonic solution = water moves IN Low [solute] in solution – Isotonic solution = NO NET WATER MOVEMENT Equal [solute] as [H 2 O]

Passive Transport - Osmosis