Chapter 3: Cells
Section 5: Active Transport
Chapter 3: Cells
Section 5: Active Transport
Chapter 3: Cells
Section 5: Active Transport
Agenda:
Do Now!
Active Transport Presentation
Finish Red Onion Osmosis Lab
Chapter 3: Cells
Section 5: Active Transport
Do Now!
Think about the words “endo-” and “exo-”
For each, write down another word that
contains these prefixes.
Next, write down what you think “endo-”
and “exo-” mean.
Chapter 3: Cells
Section 5: Active Transport
Chapter 3: Cells
• Active
Transport
In this case,
to solutes
go up or
down the
gradient?
Section 5: Active Transport
•Active transport moves solutes from
low concentration to high
concentration.
•Molecules move “up” or “against”
the gradient.
•It is “active”: it uses energy input
from the cell.
Chapter 3: Cells
• Active
Transport
Section 5: Active Transport
•Three major types of active transport:
•through protein transport pumps
•Exocytosis
•Endocytosis
•Phagocytosis
Chapter 3: Cells
• Transport
pumps
Section 5: Active Transport
•Transport pumps are proteins that
use energy to move solutes through
the membrane, against the gradient.
•They change shape as they work,
opening, closing, and exposing new
binding sites.
Chapter 3: Cells
Section 5: Active Transport
Active Transport (YouTube link)
Chapter 3: Cells
Section 5: Active Transport
Sodium-Postassium Pump (YouTube link)
Chapter 3: Cells
•Exocytosis
Section 5: Active Transport
•“Exo” means “outside”; “cyto” means
“cell”; “osis” means “process”
•the process by which a cell releases
substances by the fusion of a vesicle with
the membrane.
•Allows the cell to release molecules that
are too big for transport channels.
•Example: Neurotransmitters
Chapter 3: Cells
Section 5: Active Transport
Exocytosis (YouTube link)
Chapter 3: Cells
This is how
neurotransmitters
work!
Section 5: Active Transport
Chapter 3: Cells
•Endocytosis
Section 5: Active Transport
•“Endo” means “inside”; “cyto” means
“cell”
•the process by which a cell takes liquids
or fairly large molecules into a cell by
engulfing them in a membrane.
•Allows the cell to bring in molecules that
are too big for transport channels.
•Example: White blood cells eating
infectious bacteria
Chapter 3: Cells
Section 5: Active Transport
Endocytosis (YouTube link)
Chapter 3: Cells
•Phagocytosis
Section 5: Active Transport
•“phago” means “eat”
•a type of endocytosis in which the cell
membrane engulfs large particles.
•Example: White blood cells eating
infectious bacteria
Chapter 3: Cells
Section 5: Active Transport
Chapter 3: Cells
Section 5: Active Transport
Which
is this?
Endocytosis!
Exocytosis!
Exo- and Endocytosis (YouTube link)
Which
is this?