Transportation of Molecules. Cellular Transport Carbohydrate Chain Lipid Bilayer.

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Presentation transcript:

Transportation of Molecules

Cellular Transport Carbohydrate Chain Lipid Bilayer

Diffusion (Passive Transport) Diffusion causes many substances to move across a cell membrane but does not require the cell to use energy. Diffusion occurs from a higher concentration to a lower concentration until equilibrium is established. Passive transport video clip

Osmosis (Passive Transport) Osmosis is the diffusion of water through a selectively permeable membrane. Tea Time: diffusion/osmosis video clip

Osmosis in Action Isotonic solutions have equal concentrations of solute and water. Water will flow in and out of the cell at an equal rate Hypertonic solutions have more solute than water (concentrated). Water will flow out of the cell, causing the cell to shrink Hypotonic solution have less solute than water (dilute). Water will flow into a cell, causing the cell to swell.

Facilitated Diffusion (passive transport) In facilitated diffusion, molecules, such as glucose, that cannot diffuse across the cell membrane’s lipid bilayer on their own. They must move through the cell membrane with the help of protein channels.

Active Transport Active Transport Video Clip Active transport is a process that moves material across a cell membrane against a concentration difference and requires transport protein and energy (ATP). Example: transport of K, Na, Ca ions. Endocytosis and Exocytosis are also other form of active transport.

Active Transport