Transcript Active Transport

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?
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