CELLS AND THEIR ENVIRONMENTS

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Presentation transcript:

CELLS AND THEIR ENVIRONMENTS OSMOSIS CELLS AND THEIR ENVIRONMENTS

DIFFUSION The random movement of particles.

DIFFUSION IS.... Particles move from greater concentration to lesser concentration or from great % to less %

KEY WORDS OF DIFFUSION PASSIVE TRANSPORT CONCENTRATION GRADIENT (%HI -> %LOW) EQUILIBRIUM

WHAT IS OSMOSIS????

WHAT CONDITIONS CAUSE OSMOSIS???? HYPOTONIC------ISOTONIC------HYPERTONIC

HYPOTONIC: Water moves INTO the cell (like blowing up a balloon) ISOTONIC: water moves both directions HYPERTONIC: water moves out of the cell (dehydration)

PASSIVE TRANSPORT Passive transport does NOT require energy by the cell osmosis & diffusion facilitated diffusion

Ion (gated) channels

ACTIVE TRANSPORT CARRIER MOLECULES: cell energy required!

Endocytosis = cell eating

Exocytosis = cell EXCRETING

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