Cell Transport.

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Presentation transcript:

Cell Transport

Cell Transport Moving substances across a cell membrane

But first, a spot of tea ...

Cell Transport Passive Transport (requires no energy) Diffusion: movement from an area of high concentration to low Facilitated diffusion: membrane proteins help Osmosis: water diffuses Active Transport (requires energy and a protein "pump" to move substances from an area of low concentration to high) Bulk Transport (engulfing big particles) Endocytosis: movement into a cell Exocytosis: movement out of a cell

Passive transport: DIFFUSION Small particles and those without a charge move down a concentration gradient (from a region of high concentration to one of low concentration). Requires no energy. Passive Transport Video Clip

Passive transport: Facilitated DIFFUSION Small particles and those without a charge move down a concentration gradient (from a region of high concentration to one of low concentration) with the help of membrane proteins. Requires no energy.

Passive transport: Osmosis Water moves down a concentration gradient (from a region of high concentration to one of low concentration). Requires no energy.

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Active Transport: Requires energy and protein "pumps" in the membrane to move particles UP a concentration gradient (from an area of low concentration to an area of high concentration. Active Transport Video Clip

Large substances pass through the membrane by being "engulfed." Bulk Transport: Large substances pass through the membrane by being "engulfed." Endocytosis: movement INTO a cell. Exocytosis: movement OUT of a cell. Bulk Transport: Amoeba Feeds Video Clip

Factors affecting diffusion: Surface to volume ratio of cell of dispersing particle Temperature

Cell Transport Drawings

Diffusion (passive)

Active transport (requires pump and energy)

Diffusion

Active transport

Osmosis (passive) - the diffusion of water

Bulk transport: Endocytosis (requires energy)

Bulk transport: Exocytosis (requires energy)

Attachments Passive_Transport.asf Cell Transport Vocabulary and Practice.pptx Active_Transport.asf Amoeba Feeds!.mp4