Unit 5- Cell Membrane & Cell Transport 5b- Cellular Transport.
Passive Transport - Los Alamitos Unified School District Transport.pdfPASSIVE TRANSPORT •Movement...
Transcript of Passive Transport - Los Alamitos Unified School District Transport.pdfPASSIVE TRANSPORT •Movement...
REVIEW: What characteristics does the cell membrane have?
• Selectively permeable
• Get rid of waste
• Interact with the environment
I. CONCENTRATION GRADIENT
•Molecules have kinetic energy (they
move)
•Concentration Gradient: difference
between high and low concentration
•Molecules move “down” gradient
•Equilibrium: when all molecules are
evenly spread out
DRAW THIS!
II. TYPES OF PASSIVE TRANSPORT
• Osmosis: special diffusion of water across membrane
• Water moves where there are more solutes (solids)
III. TYPES OF TONICITY
1. Hypotonic
• More solutes inside the cell, water moves in
• The cell swells
Draw one of theseAnimal Cell Plant Cell
III. TYPES OF TONICITY
2. Hypertonic
• More solutes outside the cell, water moves out
• The cell shrinks
Draw one of theseAnimal Cell Plant Cell
III. TYPES OF TONICITY
3. Isotonic
• Equal solutes inside and outside
• Cell stays the same, equal movement of water in and
out of cell
Draw one of theseAnimal Cell Plant Cell