Respiratory System

Question 1

What is the thorax?

Answer 1

The top part of the body

Question 2

What are the lungs surrounded by

Answer 2

Pleural membranes

Question 3

Where does inhaled air go

Answer 3

Through the trachea and then into the bronchi (called bronchus). Then into smaller tubes called bronchioles and then finally the alveoli.

Question 4

Where does gas exchange occur

Answer 4

Alveoli

Question 5

How does gas exchange occur in the blood

Answer 5

The blood has a low concentration of oxygen whilst the alevoli has a high concentration from the air. Therefor oxygen diffuses into the blood through the thin cells and attaches to the red blood cells (haemoglobin) and then into cells which have a low oxygen concentration.
The blood has a high concentration of carbon dioxide whilst the alevoli has a low concentration from the air. Therefor carbon dioxide diffuses out of the blood through the thin cells.