Bell Work 9/28 Write the question with your answer

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Presentation transcript:

Bell Work 9/28 Write the question with your answer The cell membrane is mainly composed of _____________. There are also ____________ in the cell membrane which are used for cell signaling There are also __________ in the cell membrane which are used to transport large molecules

Bell Work: Egg Lab We soaked eggs in vinegar for 3 days! In your lab sheet write your prediction and hypothesis on what you think happened

Now place your egg in your cup and cover it with syrup Write your prediction and hypothesis on what you think will happen

CONCENTRATION: the amount of solute (stuff) dissolved into a solvent (liquid) KOOL-AID is the solute WATER is the solvent CONCENTRATION is how much Kool-Aid you put in

DIFFUSION: particles move from an area of HIGH concentration to an area of LOW concentration

Kool-Aid Beaker 1 Beaker 2 Beaker 3

In a solution, particles are constantly moving In a solution, particles are constantly moving. They collide with one another and tend to spread out randomly.

CONCENTRATION GRADIENT: a difference between two concentrations If diffusion is going from high concentration to low concentration, what direction is it moving on the concentration gradient? High Concentration Low Concentration

EQUILIBRIUM: the concentration of a solute is the same throughout a system the goal of diffusion!

Diffusion does NOT require energy!!

Concentration Gradient Diffusion High No Energy Concentration Gradient Low

PERMEABLE membranes allow all substances to pass through IMPERMEABLE membranes allow no substances to pass through

Biological (cell) membranes are SELECTIVELY permeable Some substances can pass through, while others cannot

Diffuse: when molecules move from high to low concentration or with the concentration gradient