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Transcript 
The Cell and Its Environment
HOMEOSTASIS
and the
ROLE OF THE CELL
MEMBRANE
What exactly is
Homeostasis???
Why do some materials pass
through the cell membrane and
others do not???
1.
2.
3.
4.
DIFFUSION-
FACTORS THAT AFFECT
THE RATE OF DIFFUSION
1.
2.
3.
DIFFUSION AND THE NATURE
OF MEMBRANES
1. Permeable2. Selectively permeable-
OSMOSIS1. Hypertonicplasmolysis
2. Hypotoniccytolysis
3. Isotonic-
Equilibrium
contractile vacuole in
paramecium
TURGOR PRESSURE
FACILITATED DIFFUSION
ACTIVE TRANSPORT
BULK TRANSPORT
• ENDOCYTOSIS
a. PINOCYTOSIS
b. PHAGOCYTOSIS
Amoeba phagocytosis
• EXOCYTOSIS
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