B11 Gas exchange in humans

Question 1

parts of the breathing system (9)

Answer 1

lungs
diaphragm
ribs
intercostal muscles
larynx
trachea
bronchi
brochioles
alveoli

Question 2

test for carbon dioxide (2)

Answer 2

bubble carbon dioxide through limewater
limewater turns cloudy/milky

Question 3

difference between inspired and expired air (3)

Answer 3

more oxygen in inspired air
more carbon dioxide in expired air
more water vapour in expired air

Question 4

how does physical activity (exercise) affect the breathing

Answer 4

when you exercise, your muscles contract (work) more
to contract more, your muscles need to use more energy
to get more energy, you need to respire more
to respire more, you need to get more oxygen (this also produces carbon dioxide)
to get more oxygen and get rid of the increased carbon dioxide in the blood which your brain detects, the rate and depth of your breathing increases

Question 5

features of gas exchange surfaces in humans (4)

Answer 5

large surface area
thin surface (short diffusion distance)
good blood supply
good ventilation with air

Question 6

what instrument do you use to measure breathing

Answer 6

spirometer

Question 7

what is the unit for depth of breathing

Answer 7

tidal volume