Slide 5 - Cell Membrane

Slide 5 - Cell Membrane - You may press T to confirm that...

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Membranes- structure and function Diffusion Osmosis
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Membranes
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Functions of membranes: 1. barrier (the main function) 2. transport (translocate molecules in and out) 3. recognition (surface proteins and carbohydrates identify the species, the individual, and the tissue) 4. signaling (hormones bind to surface receptors) signals guide embryonic development when “self” is recognized, foreign cells can be detected also
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Membranes might be the “essence of life”. amoeba The nucleus can be removed and the amoeba continues to crawl normally. But, if anything disrupts the membrane it stops immediately, and it is dead.
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Structure: membranes are bilayer of phospholipid molecules. animation Lecithin
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Membranes contain embedded proteins. Carbohydrates may be attached to the surface. A, B, O blood types are different carbohydrates attached to the surface of RBC’s.
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extracellular fluid (outside) carbohydrate phospholipid cholesterol binding site phospholipid bilayer recognition protein receptor protein transport protein protein filaments cytoplasm (inside)
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Slide 5 - Cell Membrane - You may press T to confirm that...

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