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DIFFUSION &�CELL MEMBRANE

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UNDERSTANDING LIFE SYSTEMS CELLS

3.2 identify structures and organelles in cells, �including the nucleus, cell membrane, cell wall, chloroplasts, vacuole, mitochondria, and cytoplasm, and explain the basic functions of each

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CURRICULUM

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PARTICLE THEORY (Grade 7)

states that all particles are constantly moving and bumping into each other

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DIFFUSION

in cells

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The particles bounce and they slowly spread (diffuse) throughout the room

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DIFFUSION

is the movement of particles

from an area of high concentration to an area of low concentration

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we refer to the difference in concentration between two areas as a concentration gradient

LOW CONCENTRATION

HIGH CONCENTRATION

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molecules move from an area of high concentration (many molecules) to an area of low concentration (few molecules)

LOW CONCENTRATION

HIGH CONCENTRATION

EQUAL CONCENTRATION

EQUAL CONCENTRATION

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CELL MEMBRANE

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THE CELL MEMBRANE

  • the outer covering of the cell
  • it is SELECTIVELY PERMEABLE
    • allows some things in and keeps some things out

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THE CELL MEMBRANE

  • Composed of a double layer of fats
  • Has protein channels that extend through the membrane
  • small particles (oxygen, water, carbon dioxide etc.) can pass through the fat layer

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THE CELL MEMBRANE

  • Composed of a double layer of fats

DOUBLE

LAYER

OF FATS

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THE CELL MEMBRANE

  • Has protein channels that extend through the membrane

PROTEIN

CHANNELS

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THE CELL MEMBRANE

  • Small particles (oxygen, water, carbon dioxide etc.) can pass through the fat layer
  • Large particles (sugars, fats, etc.) pass through protein channels

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PREDICT

OBSERVE

EXPLAIN

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DRAMATIC�DIFFUSION

PREDICT

OBSERVE

EXPLAIN

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HOT WATER

COLD WATER

FOOD COLOUR

FOOD COLOUR

PREDICT

P

PREDICT

OBSERVE

EXPLAIN

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PREDICT

P

IF/THEN STATEMENT

IF…

If we add food colour to the hot water,

THEN…

then it will �?????????

PREDICT

OBSERVE

EXPLAIN

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HOT WATER

COLD WATER

FOOD COLOUR

FOOD COLOUR

OBSERVE

O

PREDICT

OBSERVE

EXPLAIN

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HOT WATER

COLD WATER

FOOD COLOUR

FOOD COLOUR

OBSERVE

O

PREDICT

OBSERVE

EXPLAIN

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EXPLAIN

E

  1. Why were the different �results observed?
  2. Why was it important to use equal amounts of yeast/sand and apple juice?
  3. What does this tell you about the difference between living and non-living things?

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PREDICT

OBSERVE

EXPLAIN

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PREDICT

OBSERVE

EXPLAIN

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  • Concentration Gradient
  • Diffusion
  • Selectively Permeable
  • Protein Channels

ADD IT TO THE

W

WORD

W

WALL

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WORD

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