Diffusion and Osmosis through the Cell Membrane Phospholipids Semi-Permeable Membrane Channels Cell Membrane Transport Diffusion Osmosis Hypotonic, Hypertonic and Isotonic Solutions

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Cell Membrane The double-layer “skin” of the cell Keeps the cell organelles together Controls what comes into and leaves the cell IN SLIDESHOW MODE, CLICK THE IMAGE TO SEE HOW VIDEOS ARE EMBEDDED INTO YOUR LESSONS

The Cell Membrane Cells need an inside & an outside therefore, there needs to be something in between (like a wall for your house) this separates the cell from its environment ____________ IN food - sugars - proteins - fats O2 H2O OUT wastes proteins

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Semi-Permeable Membrane The membrane is ____________ Things like sugars, fats, proteins, oxygen, water, salt and wastes can get through Along with the phospholipids, there are many proteins and carbohydrates

Cell membrane channels Certain substances can’t pass through the membrane (too big, water soluble, etc.) but need to get in/out ____________ IN SLIDESHOW MODE, CLICK THE IMAGE TO SEE HOW VIDEOS ARE EMBEDDED INTO YOUR LESSONS Photo Credit: Blausen.com staff. "Blausen gallery 2014". Wikiversity Journal of Medicine. DOI:10.15347/wjm/2014.010. ISSN 20018762

Cell Membrane Transport The function of the cell membrane is to separate the inside of the cell from the outside while letting certain substance in and out. This is called cell membrane transport ____________

Tea Diffusion The tea particles spread out into the water VIDEO HAS BEEN REMOVED

Diffusion ____________ Molecules move from HIGH to LOW concentration Regarding the bottom left picture. When the barrier is removed, the particles spread out. This is diffusion Before After

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Keeping the water balance There are three different situations where water is moving into and out of cells

Hypotonic Solution ____________ Water enters the cell by osmosis and the cell tends to swell Example: A blood cell of a salt water fish in fresh water high concentration of water around cell compared to inside problem: cells gain water, swells & can burst This is why salt water fish can’t live in fresh water

Hypertonic Solution ____________ Example: A blood cell of a fresh water fish in salt water low concentration of water around cell problem: cell loses water Why fresh water fish can’t live in salt water

Isotonic Solution Balanced conditions ___________ example: blood problem: none volume of cell doesn’t change

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