Section 1: Exchange with the Environment

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Presentation transcript:

Section 1: Exchange with the Environment CHAPTER 4 – The Cell In Action Section 1: Exchange with the Environment

TRANSPORT ACROSS THE CELL MEMBRANE — “LIPID BILAYER”

“FLUID MOSAIC MODEL”

PASSIVE TRANSPORT  TAKING THE EASY ROAD

PASSIVE = REQUIRES NO ENERGY

PASSIVE TRANSPORT = DIFFUSION

DIFFUSION . . .

DIFUSION = OSMOSIS --- WATER !!!

OSMOSIS . . .

1) Hypertonic --- salt solution = shrink & shrivel 2) Isotonic --- tap water = normal cell 3) Hypotonic --- distilled water = swell & burst

“FACILITATED” DIFFUSION

carrier proteins are specific for the substances they transport

ACTIVE TRANSPORT = USES ENERGY

ACTIVE TRANSPORT . . .

phagocytosis & pinocytosis time to eat & drink — a cell engulfing a substance is an example of active transport phagocytosis & pinocytosis

http://www.biology4kids.com/files/cell2_mitosis.html