1. What makes active transport different to diffusion?

2. What is the formula for glucose?

3. How does a plant leaf maximise diffusion?

4. How does a plant leaf maximise surface area?

5. Where does photosynthesis take place?

6. Which transport system transports sugar?

7. Where is glucose made in a plant?

8. What conditions increase transpiration rates?

9. Which transport mechanism results in movement of water from the soil into the roots?

10. What starts the process off transpiration in a plant?

Why is diffusion important to life?

Oxygen, food and waste products are some of the substances that move by diffusion.

In animals, how do these vital substances get to where they are needed?

The substances are transported in the bloodstream, from where they can diffuse in and out of cells.

Where does gas exchange occur in the following organisms?

Structure of lungs and exchange

Lesson objectives

• All will know how the structure of the lungs

• Most will be able to explain the adaptations of the lungs

• Some will be able to evaluate the importance of the adaptations of the lungs

The breathing system is used by the body to get the oxygen needed for respiration.

It is also use to get rid of the waste product of respiration, the gas carbon dioxide.

Breathing in and breathing out are separate processes in the body:

What is breathing?

Breathing in is also known as inhalation.

Breathing out is also known as exhalation.

Structure of the lungs and exchange

• Label the diagram of the chest and lungs

Key words:LungTrachearibsIntercostal musclesDiaphragmBronchiBronchioles

Each Bronchus connects the trachea to a large air sac known as a lung.

trachea

left bronchi

left lung

right bronchi

right lung

Lungs and bronchi

Down the trachea

Through each bronchus

And through all the bronchioles within

each lung

Gas exchange takes place at the alveoli

Always remember that the CO2 is moving in the opposite direction!

Draw the route that O2 and CO2 gas takes