Active Transport DOES Require energy (or ATP) The Plasma Membrane 12/3/2018 Active Transport DOES Require energy (or ATP) Moves materials from LOW to HIGH concentration. It goes AGAINST the concentration gradient G. Podgorski, Biol. 1010

Types of Active Transport Sodium Potassium Pumps (Active Transport using proteins) Some transport proteins require energy to do work These “Protein Pumps” change shape to move molecules: this requires energy!

19) Large molecules move materials into the cell by endocytosis. The Plasma Membrane 2 Ways to Move the “Big Stuff” 12/3/2018 19) Large molecules move materials into the cell by endocytosis. G. Podgorski, Biol. 1010

The Plasma Membrane Endocytosis 12/3/2018 It takes in dissolved molecules as a “vesicle” is being formed. This is sometimes called “Cell eating”. . G. Podgorski, Biol. 1010

Now Watch it Work!  Endocytosis: taking bulky material into a cell Uses energy Cell membrane surrounds the food particle Called “cell eating” because it forms a food vacuole & digests food This is how white blood cells eat bacteria!

Another Way to Move the “Big Stuff” The Plasma Membrane Another Way to Move the “Big Stuff” 12/3/2018 2) Exocytosis- moving large things out. 20.)Large molecules are moved out of the cell by vesicles that fuse with the cell membrane through exocytosis. Exocytosis is how many hormones are secreted and how nerve cells communicate with one another. G. Podgorski, Biol. 1010

Endocytosis & Exocytosis animations Now Watch it work!  Exocytosis: a process that forces material out of cell “in bulk” Membrane surrounds the material and fuses with the cell membrane Cell changes shape – requires energy EX: Hormones or wastes released from cell Endocytosis & Exocytosis animations

Animation of Types of Active Transport Endocytosis & Exocytosis animations

Active vs Passive transport Is similar to riding a bike…It takes no energy to ride the bike and carry things downhill… (passive transport) But it takes energy to ride a bike to carry you uphill…(active transport)

Types of Cellular Transport Animations of Active Transport & Passive Transport high low Weeee!!! Passive Transport cell doesn’t use energy Diffusion Facilitated Diffusion Osmosis Active Transport cell does use energy Protein Pumps Endocytosis Exocytosis high low This is gonna be hard work!!