Download Lesson 3 | Moving Cellular Material

Name
___________ Date __________
Notes: Moving Cellular Material (Pages 61-66)
Passive Transport
1. A cell membrane is___________________ _________________________, which means that it allows
only certain substances to enter or leave a cell.
2. Passive transport is the movement of substances through a cell membrane ________________ using the
cell’s
.
3. Small molecules such as ____________________________ and __________________________ pass
directly through the membrane by passive transport.
Diffusion
1. Diffusion is the movement of ANY substances from an area of _________________________
concentration to an area of
__________________________ concentration.
2. Usually diffusion continues through a membrane until the substance reaches __________________.
3. Diffusion does ____________ require energy.
Osmosis
1. Osmosis is the diffusion of
molecules only through a membrane.
2. Since osmosis is diffusion, it does __________ require energy.
Facilitated diffusion
1. Facilitated diffusion allows molecules to pass through a cell membrane using ______________
proteins.
a. Carrier proteins carry
b.
(sugars and salts) through the cell membrane.
proteins allow ions (sodium and potassium) to pass through the cell
membrane.
Active Transport
1. Active transport uses the cell’s
(ATP) to move substances through a cell
membrane (Against the normal direction of diffusion).
2. Active transport moves substances from areas of
concentration to areas of
concentration.
Endocytosis
1. A cell uses endocytosis to ____________________ a substance by surrounding it with a
_________________ formed by the cell membrane.
Exocytosis
1. A cell’s ___________________________ release their contents ____________________ the cell during
exocytosis.