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Cell Transport

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Krishna Nayar

on 25 March 2013

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Transcript of Cell Transport

There are three factors that
affect the rate of diffusion: Obstacle 1 Obstacle 2 Obstacle 3 Cell Transport Start the diffusion of water across a selectively permeable membrane from an area of high concentration to an area of low concentration
this is essentially identical to diffusion, except it only deals with water Level 3: Active Transport Cell Transport by Krishna Nayar from an area of higher concentration... to an area of lower
concentration... Active transport is the movement of materials through a membrane against a concentration gradient.

This type of transport of materials requires energy from the mitochondria of the cell.

Active transport is different from passive transport because passive transport does not require energy. Diffusion is a process in which particles move down a concentration gradient... Concentration Concentration is
the most important factor affecting the rate of diffusion High concentration results in a faster rate of diffusion. Temperature The higher the temperature, the faster the rate of diffusion. The increase in temperature causes an increase in the rate of diffusion because it causes molecules to start moving rapidly. Pressure Increased pressure will result in rapid molecular movement which causes diffusion to occur at a faster rate. .. which results in dynamic equilibrium. OSMOSIS DIFFUSION water moves
by concentration
gradient solvent moves
by concentration
gradient What is osmosis? Examples of diffusion: Perfume

Oxygen in lungs When you spray perfume in a room, the particles start diffusing into the air right away. When oxygen molecules in your lungs diffuse into your blood cells Examples of Osmosis: Wrinkly Fingers

Salt on a Slug When you keep your fingers in water for a long time and they bloat up When you pour salt on a slug and the water diffuses out of it, which results in the slug shriveling up Osmosis Causes Tree Types of Solutions... 1. Isotonic Solutions: The concentration of the dissolved substance inside and outside the cell is the same.

Water goes in both directions.

Cells do not change shape 2. Hypotonic Solutions: The concentration is higher inside the cell rather than outside the cell.

There is more water inside than outside of the cell

Water flows into the cell 3. Hypertonic Solutions: There is more concentration outside the cell than inside.

Less water outside; more particles of the dissolved substance.

Water flows out of the cell. Level 2: Osmosis Level 1: Diffusion Endocytosis Type of active transport where macromolecules are too big to pass through the membrane.
Cell ingests macromolecules by enclosing a portion of the cell's membrane. Exocytosis Essentially the reverse of endocytosis to release contents outside of the cell Golgi apparatus is used in exocytosis Easy definiton of Endocytosis:
when cells bring large materials inside it using energy Cell ingests internal fluid by enclosing a portion of the cell's membrane. Level 3: Facilitated Diffusion Facilitated diffusion is passive transport aided by transport proteins.

It does not use energy.

The movement of materials in and out of a cell Passive Active
Facilitated diffusion Endocytosis,
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