Lungs

Question 1

Describe the process of breathing with as much correct terminology as possible.

Answer 1

Air is warmed, moistened and filtered as it travels through the mouth and nasal passages.

It then passes through the trachea and one of the two bronchi into one of the lungs.

After passing into the many bronchioles, it finally arrives into some of the millions of tiny sacs called alveoli.

This is where gas exchange takes place - oxygen passes out of the air into the blood, and carbon dioxide passes out of the blood into the air in the alveoli.

Question 2

Describe the process of inhaling with a much terminology.

Answer 2

• The intercostal muscles contract, expanding the ribcage.
• The diaphragm contracts, pulling downwards to increase the volume of the chest.
• Pressure inside the chest is lowered and air is sucked into the lungs.

Question 3

Describe the process of exhaling with as much terminology as possible.

Answer 3

• The intercostal muscles relax, the ribcage drops inwards and downwards
• The diaphragm relaxes, moving back upwards, decreasing the volume of the chest.
• Pressure inside the chest increases and air is forced out.

Question 4

What does inhaled air contain?

Answer 4

• Lots of oxygen used to create energy
• Little carbon dioxide

Question 5

What does exhaled air contain?

Answer 5

• Lots of carbon dioxide as it is a waste product of energy production
• Little oxygen as it has been used in respiration