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. No energy is involved. Movement of WATER from a high to low concentration. 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