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04 Cell Membrane (Guided Notes)

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04 Cell Membrane and Transport (Guided Notes)

According to folklore, what would happen to a child whose skin tastes salty? They’ll die

What is the modern day name for this disease? Cystic Fibrosis

1. The Cell Membrane

Composed of individual phospholipids and transport proteins

It’s function is to let things into the cell and out of the cell.

Label them on the drawing:

2. The movement of substances across the membrane occurs through two methods:

PASSIVE TRANSPORT – requires no energy | ACTIVE TRANSPORT – requires energy

3. DIFFUSION = the movement of molecules from an area of high concentration

to an area of low concentration.

Molecules tend to move from areas of high concentration to low concentration

Diffusion can occur in the AIR, or in the WATER, or across a cell membrane.

The cell membrane is semipermeable – some stuff can pass through it but not others.

When molecules are evenly spread out in a space, it is called: Isotonic

4. EQUILIBRIUM – when molecules are evenly throughout a space

5. OSMOSIS = the diffusion of water across a cell membrane

Things that can cross the cell membrane – water, ,

and other small molecules

What is the <rule= for remembering how osmosis works?

Water goes from high to low concentrations in osmosis.

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