Download What is Active transport?

Starter:
What is Active transport? Give an example
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Starter: Show the direction of water movement
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Passive and Active Transport
Osmosis
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Brainpop - Active
Transport
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Active Transport
• Requires energy to move materials UP their concentration gradient, from an area of lower concentration to an area of higher concentration.
• The opposite direction for diffusion.
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Transport Proteins
• Substances are moved molecule by molecule.
• It is similar to facilitated diffusion except that cell energy (ATP) is used in the process.
ATP = Adenosine Triphosphate
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Transport protein
Salt ion
Concentration
gradient
Cell membrane
Energy is used
Ion binds to the
transport protein
The transport protein turns over and releases the ion
onto the inside of the cell, against the concentration gradient
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Two Types of Endocytosis
• Pinocytosis = Cell drinking ­ transport of solvents or fluids
• Phagocytosis = Cell eating ­ movement of large particles or whole cells. (Many unicellular organisms feed by phagocytosis)
• Phagocytes = cells like white blood cells, which use phagocytosis to ingest bacteria and viruses that invade the body. Lysosomal enzymes then digest the invaders before they cause harm.
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Exocytosis
• The reverse of endocytosis
• Vesicles in the cell fuse with the membrane and release contents to the outside.
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Cell Membrane Pumps
(Carrier proteins that assist in active transport)
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May 16­1:02 p.m.
What is the exam on?
3 Papers in 2 hours
1. Ecology
2. Diversity of Animals
3. Cell Structure and function (cell parts and unicellular only)
May 17­9:58 a.m.
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Baseline Quiz!
Jun 22­2:33 p.m.
Home Learning
You are to design a 17 word crossword on this unit. Jun 22­2:39 p.m.
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Past Paper Question:
Plant Cell: Root Hair
Animal Cell: Small Intestine
(a)
Describe ONE similarity (other than size) in the structure of these two cells for absorbing materials.
(b)
Explain how this similarity affects how these cells absorb materials.
(c)
Osmosis and active transport are both processes used by cells. Compare and contrast these two processes.
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Mar 27­2:42 p.m.
Structure and Functions!
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Jun 22­3:13 p.m.
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Jun 16­9:56 a.m.
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