Page 92 - Science Course 1 (Book 1)

Cell Transport Mo3-L5a: How Does Material Enter and

Leave Cells?
Lesson 5

In this topic, you will learn the following
lessons:

Mo.3 - L5a: How Does Material Enter and Leave
Cells?

Mo3-L5a How Does Material Enter and Net Diffusion Net Diffusion Equilibrium
Leave Cells?
KEY CONCEPTS: Net Diffusion Net Diffusion Equilibrium
1. How do materials enter and leave cells?
2. How does cell size affect th transport of (b) Diffusion of two solute
materials?
Osmosis
Vocabulary A-Z the diffusion of water molecules only through a
membrane.
Let us learn some vocabulary Membrane

Passive Transport
Original water
the movement of substances through a cell Level
membrane without using the cell’s energy.

Outside Cell Salt Water Fresh Water

Facilitated Diffusion

the process by which molecules pass through a cell
membrane using special proteins called transport
proteins.

Inside Cell
Outside Cell

Diffusion
the movement of substances from an area of high
concentration to an area of low concentration.
Membrane (cross section)

Inside Cell

Water

Net Diffusion Net Diffusion Equilibrium
(a) Diffusion of one solute
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