Unit 11

Question 1

Describe the 4 features of gas exchange surfaces in humans

Answer 1

large surface area, thin
surface, good blood supply and good ventilation
with air

Question 2

Identify in diagrams and images the following parts of the breathing system: lungs, diaphragm, ribs, intercostal muscles, larynx, trachea, bronchi, bronchioles, alveoli and associated capillaries

Answer 2

look it up

Question 3

Investigate the differences in composition
between inspired and expired air using limewater as a test for carbon dioxide

Answer 3

inspired air:

expired air:

Question 4

Describe the differences in composition between
inspired and expired air, limited to: oxygen,
carbon dioxide and water vapour

Answer 4

inspired air:

expired air:

Question 5

Investigate and describe the effects of physical activity on the rate and depth of breathing

Answer 5

rate of breathing before:
during:
after:

Question 6

Identify in diagrams and images the internal and external intercostal muscles

Answer 6

inside ribs muscle vs outside rib muscles

Question 7

State the function of cartilage in the trachea

Answer 7

prevent it from collapsing

Question 8

Explain the role of the ribs, the internal and
external intercostal muscles and the diaphragm
in producing volume and pressure changes in the
thorax leading to the ventilation of the lungs

Answer 8

meow

Question 9

Explain the differences in composition between
inspired and expired air

Answer 9

you know…

Question 10

Explain the link between physical activity and the rate and depth of breathing in terms of: an increased carbon dioxide concentration in the blood, which is detected by the brain, leading to an increased rate and greater depth of breathing

Answer 10

increase in jajkdnaksjndan

Question 11

Explain the role of goblet cells, mucus and
ciliated cells in protecting the breathing system from pathogens and particles

Answer 11

mucus transport