4.5

Question 1

Greg has a tidal volume of 550mL. Does that mean 550mL of air will enter and leave Greg’s alveoli with each respiratory cycle and undergo gas exchange?

Answer 1

• No
• This doesn’t account for alveolar dead space

Question 2

Describe how loading of CO2 onto Hb makes it easier for O2 to unload (Haldane Effect)

Answer 2

• CO2 loaded on, forms carbonic acid thanks to carbonic annhydrase
• Ionises, H+ binds to haemoglobin
• Makes it easier for O2 to unbind