9 Transport part 2 .pdf

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Original filename: 9 Transport part 2.pdf
Title: Cell Structure and Function
Author: Technology Education

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Movements Across
Plasma Membranes


Molecular MovementsIn and Out of Cells

2 Types:
1. Transports that do not require energy
2. Transports that require energy

Transports That Do Not Require Energy:
Passive Transport

Does not require input of energy
Molecules pass through membrane
from an area of high concentration to
an area of low concentration
2 Types:

Simple Diffusion

Facilitated Diffusion

1. Simple Diffusion

Small molecules pass through the
phospholipid bilayer
No energy needed
Movement: high concentration to low
Examples: CO2,
O2, H20

2. Facilitated Diffusion

Molecules pass through a transport
No energy needed
Movement: high concentration to low
facilitated diffusion
Example: Glucose

Energy Requiring Transport

Molecules move from an
area of low concentration
to an area of high
“against the gradient”
3 Types:

Active Transport



1. Active Transport

Carrier protein in membrane attaches
to a specific molecule
Carrier protein changes shape as
molecules crosses the membrane
Energy is required
K ,Na ions

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