B11 gas exchange in humans Flashcards
1
Q
A
2
Q
adaptations for gas exchange in humans
A
- large surface area
- thin surface
- good blood supply
- good ventilation with air
3
Q
how to investigate differences in composition between inspired and expired air
A
limewater to test for co2
4
Q
composition of inspired air
A
- 21% oxygen
- 0.04% co2
- water vapour level depends on humidity
5
Q
composition of expired air
A
- 16% oxygen
- 4% co2
- water vapour level always high
6
Q
explain the differences in composition of inspired and expired air
A
- oxygen used by cells during aerobic respiration
- co2 is waste product of respiration, must be removed from body
- moisture evaporates from cells of gas exchange
7
Q
explain effect of physical activity on rate and depth of breathing
A
- increased co2 conc in blood
- detected by brain
- increase rate and depth of breathing
