Pathway of air - Bexhill High Academy · lungs. They then split into smaller and smaller bronchi....

Pathway of air

Lesson 1: Pathway of air & Gaseous

exchange

Lesson 2: Gaseous exchange &

mechanics of breathing

* Understand the pathway of air through our respiratory system (3-

4)

** On a diagram identify the different parts of the respiratory

system and their functions (5-6)

*** Explain how the features of the alveoli assist gaseous exchange

(7-9)

Big question: Why is oxygen so

important?

Starter: sort the following key terms for

the cardio-respiratory system

Respiratory

system

Cardiovascular

system • Mouth/nose

• Left ventricle

• Trachea

• Bronchi

• Bronchioles

• Systolic

• Lungs

• Stroke volume

• Heart

• Alveoli

Clue: Cardio = heart

Only 4 fall under cardiovascular

Respiratory system

(Lungs)

Cardiovascular system

(Heart)

• Mouth

• Trachea

• Bronchi

• Bronchioles

• Alveoli

• Left ventricle

• Systolic

• Stroke Volume

Mouth

Nose

Trachea

Bronchi

Bronchioles

Lungs

Alveoli

Diaphragm

Video

https://www.youtube.co

m/watch?v=8NUxvJS-_0k

Task: Label the diagram

Key terms

Trunk = Trachea

Branches = Bronchi

Twigs = Bronchioles

Leaves = Alveoli

Mouth & Nose We breathe in through our nose and mouth. Trachea The air travels into the trachea. The inside of the trachea is covered in small hairs called cilia. The trachea is kept open by rings of cartilage.

Trachea

What is the function of the

cilia?

Bronchi

The trachea splits left and

right to enter the left and right

lungs. They then split into

smaller and smaller bronchi.

Bronchioles

Small bronchi divide into

bronchioles which are very

narrow tubes less than 1mm

in diameter.

Alveoli

Diffusion:

Is the movement of gas from an area

of high concentration to an area of

low concentration

Name 3 features of the respiratory system

and explain how it assists in gaseous exchange

(6 marks).

Large surface area

Moist thin walls (1 cell thick)

Lots of capillaries

Short distance for diffusion