BB lecture 10-3-08 diffusion, osmosis

BB lecture 10-3-08 diffusion, osmosis - hapter 6...

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Chapter 6 (pp.120-121) - Intercellular junctions Learning objective Distinguish between gap, desmosome, tight, and plasmodesmata intercellular junctions Chapter 7 (pp. 125-140) – Cell membrane functions Learning objectives Know the different functions provided by membrane proteins - Explain the different ways substances are moved across membranes by transport proteins Understand the importance of ‘gradients’; effects on and utilization by the cell Distinguish passive from active transport; simple from facilitated diffusion Define osmosis and explain how cells respond to solutions of different tonicity Terms to know include… concentration gradient, diffusion, osmosis, tonicity, hypo-, iso-, hyper-tonic, plasmolysis, turgid, flaccid, aquaporins, membrane potential, electrochemical gradient, proton pump, sodium-potassium pump…
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Review: Tell someone nearby a function of At Least One of the following - 1. Mitochondria 1. Chloroplasts 1. Peroxisomes 1. Cytoskeleton Microfilaments Microtubules Intermediate filaments 1. Celia and flagella 1. Plant cell wall 1. Centrosome 1. Ribosomes Describe four different intercellular junctions
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Here is the web site that shows cell organelles in animation: The Inner Life of the Cell How many structures can you recognize? http://www.xvivo.net/press/harvard_university.htm (Thanks to Andy Wine)
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Intercellular Junctions Neighboring cells in tissues, organs, or organ systems often adhere, interact, and communicate through direct physical contact Intercellular junctions facilitate this contact Animal cells have 3 types: Tight ”; Desmosomes Gap Plant cells have plasmodesmata – which are analogous to ‘Gap’ junctions in animal cells
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Animals: Tight Junctions , Desmosomes , and Gap Junctions At tight junctions , membranes of neighboring cells are pressed together, preventing leakage of extracellular fluid (think of a continuous welded seam that is watertight) Desmosomes ( anchoring junctions ) fasten cells together into strong sheets (think of widely spaced rivets that are strong points of attachments, but not
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BB lecture 10-3-08 diffusion, osmosis - hapter 6...

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