Passive Transport
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There are two main types of cellular transport - passive and active. Passive transport does not require energy and includes diffusion, facilitated diffusion, and osmosis. Active transport moves molecules against their concentration gradient and requires energy from ATP. The sodium-potassium pump is an example of active transport, moving sodium and potassium ions across the cell membrane against their gradients. Large molecules are transported across membranes via endocytosis and exocytosis using vesicles.
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Passive Transport
- 1. Cellular Transport â 07 Biology
Hinweis der Redaktion
- What is meant by the word transport? Moving substances across the cell membrane
- What is the cell membrane made of? Lipids make it polar--> oxygen and co2 can readily pass through Small molecules can pass through protein pores
- Spray aerosol into the corner of the classroom Kinetic energy --> Particles are constantly moving and bumping into each other Start a mosh pit in the corner of the classroom In the absence of outside influence diffusion will continue until equilibrium is reached
- Molecules may be too large or not soluble in lipids --> glucose
- Hypotonic solutions are good Cells adapt by pumping water or solutes out of the cytosol (contractile vacuoles or solute pumps) Plants love hypotonic environments --> turgor pressure Hypertonic solutions are badâŠemkay Results in the loss of water --> plasmolysis Some cells cannot adjust to changes in environment (rbcâs) --> cytolysis or âcell bursting â may result
- Macromolecules, nutrients, large quantities of small molecules
- The vesicles then fuse with other membrane bound organelles within the cell
- Phagocytosis can be used to ingest bacteria or viruses that invade the body! Pic --> white blood cell ingestng bacteria