Transcript Essential Question: What is active and passive transport?

Essential Question: What is active and
passive transport?
Cells transport materials across the cell
membrane by active transport and
passive transport.
Passive Transport: movement of
materials without the use of energy
from a high to low concentration.
There are two types of Passive Transport:
Diffusion
Osmosis
Diffusion•
No energy is involved.
•
Movement from a high
concentration to a low
concentration.
•
End result is an equal
concentration in and
out of the cell
(equilibrium).
•
Exs. Perfume, Pizza,
Locker Room
Osmosis
•
Osmosis:
• No energy is involved.
Movement of WATER from a high to low
concentration.
Three Situations Involving
Osmosis:
Isotonic Solution:
• Amount of dissolved substances in the
cell = the amount of dissolved
substances out of the cell.
• EX.:
1.Thus no movement of water.
Hypotonic Solution
•
Hypotonic Solution- the amount of
dissolved substances in the environment
is lower than the amount of dissolved
substances in the cell.
•
Thus water will flow into the cell. The
cell begins to swell. If too much water
goes into the cell, it will burst like a
balloon.
Hypertonic Solution
Hypertonic Solution- the
amount of dissolve
substances is larger
in the environment
than in the cell.
• Thus cell will loose
water. The cell will
shrink. Ex. Wilted
celery, cooking
meat.
Types of Solutions
Essential questions :
 What is active transport?
 What are the types of active transport?
Active Transport
Active Transport-movement of materials
from a low to high concentration with the
use of energy.
There are Two Types of Active Transport:
 Endocytosis
 Exocytosis
Endocytosis: Uses energy.
Process of surrounding an
organism and taking it in.
Phagocytosis is a type of endocytosis
Process by which a cell surrounds and takes
in material (food) from its environment
Ex. WBC- bacteria
Phagocytosis
Die E. Coli
Exocytosis:

Uses energy
•Reverse of endocytosis
•Process by which a cell expels
or secretes material from a cell.
Ex. Waste products, hormones