1.3 breathing and combustion

Question 1

What is the correct path of air through the respiratory system?

Answer 1

Nasal/oral cavity → pharynx → larynx → trachea → bronchi → bronchioles → alveoli

Question 2

What is the diaphragm?

Answer 2

A tough muscular membrane that separates the chest cavity from the abdominal cavity

Question 3

What are the three main functions of the nasal cavity

Answer 3

1. Warms incoming air
2. Moistens the air
3. Filters dust and germs

Question 4

What is the epiglottis?

Answer 4

A flap that closes off the windpipe when swallowing food

Question 5

What is the uvula?

Answer 5

A flap that closes off the nasal cavity when swallowing food

Question 6

What are alveoli?

Answer 6

Tiny air sacs at the end of bronchioles where gas exchange occurs; total surface area 70-100 m²

Question 7

What are pulmonary capillaries?

Answer 7

Small blood vessels surrounding the alveoli where oxygen and carbon dioxide exchange takes place

Question 8

What is the function of cilia?

Answer 8

: Small hairs that sweep mucus and dust particles towards the pharynx for swallowing