Breathing

Learning Objectives: To understand the role of the respiratory

system in humans. To know how breathing links to cellular

respiration. To visualise how the lungs work using a model.

Feel yourself breathing

Sit still and close your eyes Concentrate on what happens as you breathe

in and out. Focus on how your chest expands and relaxes. Think about what parts of your body are

moving.

The Respiratory System

Ribs – to protect the chest

Bronchioles

Bronchi Trachea – has stiff rings of cartilage to prevent it collapsingRib muscles –

to raise and lower the ribs

Lung

Diaphragm – muscular sheet

Alveoli (“air sacs”) – gas

exchange takes place here

Why are these so different?

Explain why we need to take in oxygen and get rid of carbon

dioxide.

Breathing

Learning Objectives: To understand the role of the respiratory

system in humans. To know how breathing links to cellular

respiration. To visualise how the lungs work using a model.