Warm-UP 1.  Why is osmosis considered passive transport?

2.  In a hypertonic environment… What will happen to the cell?

3.  In a hypotonic environment…. What will happen to the cell?

•  Agenda •  Active Transport Notes •  Egg Lab Demo •  Starch and Iodine Lab •  Active Transport WS •  Work on Study Guide •  Concept Map

The Cell Membrane and

Types of Transport

Active Transport requires energy

•  Active transport is another way that substances can move through a cell membrane.

•  However, in active transport molecules move against the concentration gradient (low to high) •  Therefore, active transport requires energy!

•  There are 2 types of active transport: 1.  Cell Membrane Pumps 2.  Vesicles

Cell Membrane Pumps a type of active transport

•  Unlike the process of facilitated diffusion, in active transport, molecules are “pumped” across the cell membrane by pumps called transport proteins. •  This pumping process requires energy.

•  Because this process does not depend on diffusion, cells can use this process to bring in needed molecules or remove waste from the cell.

Active Transport Requires Energy (ATP!)

Vesicles a type of active transport

•  Another type of active transport happens when molecules are too large to pass through a cell membrane, even with the aid of transport proteins.

•  These molecules require the use of vesicles to help them through the membrane. •  Endocytosis: large molecule is passing into the cell. •  Exocytosis: large molecule is passing out of the cell.

Endocytosis vs. Exocytosis

Now?

•  Starch and Iodine Lab •  Egg Lab •  Notebooks •  Starch and Iodine Lab Questions •  Active Transport WS

•  Concept Map

•  Work on Study Guide •  Notebooks graded tomorrow •  (Vocab, Starch Iodine, Active Transport WS, study guide)

•  Quiz tomorrow on Active and Passive Transport