the lungs

Question 1

what do the lungs contain?

Answer 1

the lungs are surrounded by the ribcage - the air u breath goes through ur trachea - then spilts into 2 tubes called bronchi (one goes to each lung - the bronchi then progressively split into smaller tubes called bronchioles - the bronchioles finally split into small bags called the alveoli (where gas’s exchange happens

Question 2

what do the alveoli carry out?

Answer 2

gas exchange - the alveoli are surrounded by a network of blood capillaries where gas’s exchange happens

Question 3

how do the alveoli work?

Answer 3

the blood passing next to the alveoli has just returned to the lungs from around the body, so it contains lots of carbon dioxide and little oxygen. Oxygen diffuses out the alveolus, and the carbon dioxide diffuses out the blood into the alveolus to the be breathed out

Question 4

how do the alveoli

Question 5

how do you work out breathing rate?

Answer 5

breaths per min = number of breaths/ number of mins