(CST) Cell Transport Lesson

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Cell Transport }

How do substances get into and out of a cell? How does the cell control the movement of molecules into and out of the cell? In this lesson, you will learn the different ways molecules move in and out of the cell in order for the cell to maintain homeostasis.

Watch the following video for an introduction to cell transport:

Let's Go!

The Two Types of Transport are Passive & Active Transport.

PASSIVE Passive transport is the movement of molecules from high to low concentration without the addition of energy. Molecules move with the concentration gradient (gradual difference of a dissolved substance between a region of high concentration and low concentration). Examples are diffusion, osmosis (movement of water from high to low concentration), and facilitated diffusion. ACTIVE Active Transport is the movement of molecules from low to high concentration with the addition of energy (usually ATP). This means that molecules move against the concentration gradient. Examples are pumps, exocytosis, and endocytosis.

Passive vs. Active

Passive transport is the movement of molecules from high to low concentration without the addition of energy.

Active Transport is the movement of molecules from low to high concentration with the addition of energy.

Let's Take a Closer Look at These Different Types of Transports

Passive Transport =

Active Transport =

Cell Transport Challenge and Before You Go

Practice Time! Use the knowledge you learned from the lesson to complete the practice activities below.

Before You Go - You Need To Know

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The following key points are from the explore section of the lesson. You must know the following information before moving to the next lesson. This is just a summary of the key points.
  • What is the difference between passive and active transport?
    • Passive transport is the movement of molecules from high to low concentration without energy being added
  • What are examples of passive transport?
    • Diffusion, Osmosis, and Facilitated Diffusion
  • What are the examples of active transport?
    • Exocytosis, Endocytosis, Pumps

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