Movement of substances through the cell membrane..

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Movement of substances through the cell membrane.

Passive movement of substances through the cell membrane (no cellular energy required) 1.Diffusion: The process by which molecules or ions scatter or spread spontaneously from regions of high concentration to low concentration. What happens to the candy when it is placed in water? Watch this LINKLINK

Passive Movement 2.Facilitated diffusion: When molecules such as sugar are too large to pass through the pores of the cell membrane, carrier molecules carry the large molecules from regions of higher to areas of lower concentration. LINK

Passive Movement 3. Filtration: Movement of molecules across a membrane as a result of pressure LINK Summary online.com/objects/i ndex_tj.asp?objID= AP11103http:// online.com/objects/i ndex_tj.asp?objID= AP11103

4. Osmosis: A special case of diffusion in which water molecules diffuse from regions of higher concentration to area of lower concentration. LINK

What do you think will happen to red blood cells when the are placed in a hypertonic solution? Watch the video. dIp8&feature=related dIp8&feature=related

What do you think will happen to red blood cells when the are placed in a hypotonic solution? Watch the video. jAM&feature=related jAM&feature=related

Active Mechanisms (Use cellular energy) Active transport -process that moves particles through membranes regions of lower concentration to regions of higher concentration. animation and quiz

ACTIVE TRANSPORT 1. Sodium Potassium Pumps Uses specific carrier molecules (pumps) Uses 40% of the cell’s energy Particles transported include sugars, amino acids, sodium, potassium, calcium and hydrogen ions amazing students

2. Endocytosis- large particles are brought into a cell through vesicles a. pinocytosis- cell takes in liquids b. phagocytosis- cell takes in solids c. receptor mediated -specific molecules move into cell 3. Exocytosis- a substance stored in a vesicle is released from the cell Animation

Summary Passive transport- the cell does not expend energy 1. diffusion -movement of molecules -no force 2. osmosis -diffusion of water molecules -no force 3. filtration -filter present -force

Summary Active transport- the cell uses energy to move molecules 1.Cell membrane pumps - Proteins in the cell membrane pump ions across the concentration gradient 2. endocytosis -cell engulfs solids or liquids 3. exocytosis -cell releases substances

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