CELL TRANSPORT Types of Transport Across the Cell
- Slides: 28
CELL TRANSPORT Types of Transport Across the Cell Membrane
Smelly Balloons Draw and fill out in your science notebook. Balloon Color Blue Red Pink Yellow Scent
l Answer in your science notebook. l How do “smells” get out of the balloon?
Essential Questions l How do cells maintain homeostasis (makes a cell stable and healthy)? l How are materials transported in and out of a cell? l Why is important to regulate what moves in and out of a cell?
Semipermeable Membrane l The cell membrane allows some materials in and out! l https: //www. youtube. com/watch? v=Ptmlvt ei 8 hw
Simple Diffusion l. Requires NO energy ¡Molecules move from area of HIGH to LOW concentration
Diffusion is a PASSIVE process which means no energy is used to make the molecules move, they have a natural KINETIC ENERGY
Diffusion of Lipids
Diffusion Through a Membrane l Solute moves DOWN the concentration gradient. (HIGH to LOW)
Osmosis l Diffusion of water across a membrane ¡ Moves from HIGH water concentration to LOW water concentration l Water is attracted to solutes (like salt) so it will also travel to areas of low solute concentration to high solute concentration.
Diffusion of Water Across A Membrane l High water concentration l Low solute concentration Low water concentration High solute concentration
Cells in Solutions l Isotonic ¡A solution whose solute concentration is the same as the solute concentration inside the cell. l Hypotonic ¡A solution whose solute concentration is lower than the solute concentration inside a cell l Hypertonic ¡A solution whose solute concentration is higher than the solute concentration inside a cell.
Cell in Isotonic Solution l What is the direction of water movement? The solute and water concentrations are the same inside and outside the cell. ¡ The cell is at EQUILIBRIUM ¡ Water will flow in both directions outside and inside the cell.
Cell in Hypotonic Solution l What is the direction of water movement? ¡ The water is going INSIDE the cell. l Water is attracted to the solute inside the cell. The solute concentration is greater inside the cell than outside, therefore water will flow into the cell.
Cell in Hypertonic Solution l What is the direction of water movement? ¡ The water is GOING OUT of the cell. The solute concentration is greater outside the cell, therefore water will flow outside the cell.
Cells in Solutions
Cells in Solutions l Isotonic solution l l No net movement of water. EQUAL amounts leaving and entering hypotonic solution CYTOLYSIS hypertonic solution PLASMOLYSIS
Cells in Solutions l Cytolysis cytolysis in elodea. ¡The destruction of a cell. l. Cells swell and burst l Plasmolysis in elodea. ¡The shrinking of a cell. l. Cells shrink and shrivel Normal elodea plant cell
Cytolysis & Plasmolysis l Cytolysis Plasmolysis
Osmosis in Red Blood Cells l Isotonic Hypertonic
Three Forms of Transport Across the Membrane l Passive Transport Active Transport
Passive Transport: Simple Diffusion l Simple Diffusion ¡ Doesn’t require energy ¡ Moves high to low concentration l Example: Oxygen or water diffusing into a cell and carbon dioxide diffusing out.
Passive Transport: Facilitated Diffusion l Facilitated Diffusion ¡ Does not require energy ¡ Uses transport proteins to move high to low concentration l Examples: Glucose or amino acids moving from blood into a cell.
Proteins are Crucial to Membrane Function
Facilitated Diffusion Molecules will randomly move through the pores in Channel Proteins.
Types of Transport Proteins l Channel proteins are embedded in the cell membrane & have a pore for materials to cross l Carrier proteins can change shape to move material from one side of the membrane to the other
Facilitated Diffusion l Some carrier proteins do not extend through the membrane. ¡ They bond and drag molecules through the lipid bilayer and release them on the opposite side.
Active Transport l Active Transport ¡ Requires energy or ATP l Moves materials from LOW to HIGH concentration • AGAINST concentration gradient
- Sodium potasium pump
- Primary active transport and secondary active transport
- Now answer the following questions
- Active transport vs passive transport venn diagram
- Unlike passive transport active transport requires
- Primary active transport vs secondary active transport
- Bioflix activity membrane transport active transport
- Active transport image
- Selectively permeable definition biology
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