Warm-Up # 9 11/8/12 5) Osmosis and diffusion are examples of what type of transport? 6) What type of transport requires energy?

Active Transport Unit 4

Active Transport EQ Obj Why is active transport essential for life on Earth? Obj Differentiate between the four types of active transport

Active Transport Cell must move material UP the concentration gradient from areas of low to high. USE OF ENERGY (ATP)!!! Like walking UP a SLIDE

How’s it work? Uses carrier proteins Act as pumps that use energy to move ions and molecules across the membrane Important in maintaining ion concentration in cells

Active Transport in Plants Enables roots to absorb nutrients from the soil Without active transport, nutrients would diffuse out of the roots. Plants get nutrients AGAINST the concentration gradient (against GRAVITY)

Bulk Transport of STUFF Some molecules such as complex proteins are to LARGE to cross the cell membrane Large molecules of food and other substances are packaged in membrane bound sacs called vesicles and moved across the membrane

Happens Four Ways Endocytosis Exocytosis Phagocytosis Pinocytosis

Endocytosis Cell membrane folds into a POUCH that encloses the particles Pouch pinches off INSIDE the cell to form a vesicle Vesicle releases contents into the cytoplasm

Two Types of Endocytosis Phagocytosis—Cell engulfs a food particle or other cells “CELL EATING” Vesicle fuses with a lysosome How we get rid of bacteria Pinocytosis– Cells engulf liquid/fluid “CELL DRINKING”

Exocytosis Opposite of endocytosis Waste and cell products LEAVE the cell Products made in the cell are packaged in the golgi, and secreted out of the cell “Cell throwing up”

Create a Venn Diagram Compare and contrast Passive and Active Transport