Chapter 8-1: Cellular Transport

Osmosis

Water wants to be equal on both sides of the cell

Osmosis cont…

Osmosis—diffusion (movement) of water

Helps maintain homeostasis

Osmosis cont…

Isotonic Solution Water is equal on both sides of the cell No water movement Cells remains circular

Osmosis cont…

Hypotonic solution More water outside the cell than in Water moves into the cell Causes an increase in cell shape Cell may burst

Hypotonic solution cont…

Plant cells don’t burst The plant becomes more firm Grocers use this

Hypertonic Solution

Less water outside the cell Water moves out of the cell Cells shrivel Ex: Plants will wilt; Animals

become dehydrated

Passive Transport

Movement into/out of cell using no energy

Used to move water into/out of cell

Facilitated Diffusion

Type of passive transport No energy needed Uses transport proteins to move

things into/out of cell Ex: Food

Active Transport

Movement of particles into/out of cell using energy

Active Transport cont…

Endocytosis Take materials in

Active Transport cont…

Exocytosis Expel materials out Ex: Wastes and Hormones