7.3.4 ACTIVE TRANSPORT

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Cell Transport

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Slide1:

Define Active Transport Describe 3 (three) types of Active Transport: Cell Membrane Pumps Endocytosis Exocytosis Learning Target

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Energy Used to Move Cellular Materials ACTIVE TRANSPORT

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Substances move in and out of cells by passive and active transport. Which methods of transport are illustrated? Movement in and out of cells

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In addition to Passive Transport, substances can also move in and out of a cell using a process called ACTIVE TRANSPORT. As the name suggests, active transport requires ENERGY from the cell. What is ACTIVE TRANSPORT?

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DIFFUSION involves molecules moving down a concentration gradient from HIGH to LOW concentration. Sometimes substances move into cells from LOW to HIGH concentration. This is called active transport . Active transport needs ENERGY to make it happen. HIGH concentration LOW concentration diffusion active transport What is ACTIVE TRANSPORT?

Active transport always requires ATP energy molecules:

Active transport always requires ATP energy molecules ATP

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During active transport , The molecules transported by the carrier proteins are moved UP the concentration gradient. This requires energy!

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Describe 3 (three) types of Active Transport: Cell Membrane Pumps Endocytosis Exocytosis Learning Target

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PROTEINS not only assist in passive transport, as in facilitated diffusion , but they can be used for active transport as cell membrane “pumps.” 1. Cell Membrane Pumps

1. Protein Pumps:

1. Protein Pumps Example : Sodium / Potassium Pumps are important in nerve responses. Sodium Potassium Pumps (Active Transport using proteins) Protein changes shape to move molecules: this requires energy!

Sodium-Potassium Pump is important for nerve cells.:

Sodium-Potassium Pump is important for nerve cells. The pump is what causes the conduction of electrical impulses along nerve cells.

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ENDOCYTOSIS is a process by which cells take fluid, macromolecules, and large particles from OUTSIDE the cell and bring it INSIDE the cell. 2. Endocytosis

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The cell membrane forms a small pouch which pinches off in the cell to form a VESICLE . Vesicles can fuse with LYSOSOMES and their contents are digested with enzymes . 2. During Endocytosis…

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1. PINOCYTOSIS – T ransport of solutes or fluids 2.PHAGOCYTOSIS Transport of large solids or whole cells. There are 2 types of ENDOCYTOSIS :

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Phagocytosis About to Occur

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3. EXOCYTOSIS EXOCYTOSIS is a process by which cells take fluid, molecules , and large particles from the INSIDE of the cell and release their contents to the OUTSIDE environment.

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3. EXOCYTOSIS The opposite of endocytosis is EXOCYTOSIS . Large molecules that are manufactured in the cell are released through the cell membrane . Inside Cell Cell environment Endocytosis & Exocytosis animations

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Unicellular organisms may get rid of wastes through exocytosis .

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