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Cellular Transport. Weeee!!!. high. low. This is gonna be hard work!!. high. low. Types of Cellular Transport. Passive Transport cell doesn’t use energy Active Transport cell does use energy. Passive Transport. cell uses no energy molecules move randomly - PowerPoint PPT Presentation
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Cellular Transport
Types of Cellular Transport
• Passive Transport cell doesn’t use energy
• Active Transportcell does use energy
high
low
Weeee!!!
high
low
This is gonna be
hard work!!
Passive Transport• cell uses no energy • molecules move randomly• Molecules spread out from an area of high
concentration to an area of low concentration.
• (HighLow)• Three types:
3 Types of Passive Transport
1. Diffusion 2. Facilitative Diffusion –
diffusion with the help of proteins
3. Osmosis – diffusion of water
1. Diffusion
1. Diffusion: random movement of particles from an area of high concentration to an area of low concentration.
(High to Low)• continues until all molecules are
evenly spaced
• Equilibrium = evenly spaced
• Note: molecules will still move around but stay spread out.
http://bio.winona.edu/berg/Free.htm
Simple Diffusion Animation
2. Facilitated diffusion: diffusion of specific particles through proteins found in the membrane – Transports larger or
charged moleculesFacilitated diffusion (Channel Protein)
Diffusion (Lipid
Bilayer)
: 2. Facilitated Diffusion A B
• http://bio.winona.edu/berg/Free.htm
• 3.Osmosis: diffusion of water through a selectively permeable membrane
• Water moves from high to low concentrations
• Water moves freely through pores.
• Solute (green) too large to move across.
Osmosis animation3. Osmosis
Effects of Osmosis on Life
• Water is called the called the "universal solvent" because it dissolves more substances than any other liquid.
• This means that wherever water goes, either through the ground or through our bodies, it takes along valuable chemicals, minerals, and nutrients.
• The substances that are dissolved are called solutes.
How Organisms Deal with Water Pressure
• Paramecium (protist) removing excess water video
• Bacteria and plants have cell walls that prevent them from over-expanding.
• A paramecium that collect water flowing in and pump it out to prevent them from over-expanding.
• Salt water fish pump salt out of their specialized gills so they do not dehydrate.
• Human cells are bathed in blood. Kidneys remove excess salt and water.
Active Transport
• cell uses energy • actively moves molecules to where they are needed
• Movement from an area of low concentration to an area of high concentration
•(Low High)• Three Types:
Types of Active Transport
1. Protein Pumps -transport proteins that require energy to do work• Example: Salt Pumps
are important in nerve responses.
Sodium Pumps (Active Transport using proteins)
Protein changes to move molecules: this
requires energy!
• What happens when the material that a cell needs to move into or out of the cell is too big to fit through the cell membrane or a protein?
Types of Active Transport
2. Endocytosis: takes bulky material
into a cell • Cell membrane folds in
around the material• “cell eating”• forms food vacuole &
digests food• This is how white blood cells
eat bacteria!
Types of Active Transport
3. Exocytosis: Forces material out of cell• membrane surrounding the
material fuses with cell membrane
• Cell changes shape – requires energy
• EX: Hormones or wastes released from cell
Endocytosis & Exocytosis
animationsCell membrane
Types of Cellular Transport
• Passive Transport cell doesn’t use energy
1. Diffusion2. Facilitated Diffusion3. Osmosis
• Active Transportcell does use energy
1. Protein Pumps2. Endocytosis3. Exocytosis
high
low
This is gonna
be hard work!!
high
low
Weeee!!!
• Animations of Active Transport & Passive Transport
This powerpoint was kindly donated to www.worldofteaching.com
Modified by Robin O’Connor October 2010