Chapter 8

Question 1

What is the pathway that air moves through the body

Answer 1

Mouth or nostril —> nasal cavity —> Pharynx —> Larynx —> Trachea —> Bronchi & bronchioles —> alveoli

Question 2

What are the organs of the respiratory system

Answer 2

The nose, the trachea, the bronchi and two lungs

Question 3

Respiration equation

Answer 3

Oxygen + glucose —> carbon dioxide + energy + water

Question 4

What is the main role of the respiratory system

Answer 4

The exchange of gas (oxygen and carbon dioxide) between the body and the environment

Question 5

Why is the respiratory system important

Answer 5

As all cells require oxygen to metabolism food in cellular respiration

Question 6

what are the 5 reasons that the lungs are well suited to their gas exchange function

Answer 6

• The alveoli give the lungs a huge internal surface area (large amounts exchanged
• each alveolus is well supplied with blood vessels so that as much blood as possible is close to the air in the alveolus (maintains different concentration)
• thin wall
• deep in body to prevent evaporation of fluid that cover respiratory surfaces
• lung volume can be changed by movements of the respiratory surfaces