O-LevelBiologyRespiration5090/22 · Oct/Nov 2016 · Q710 Marks
Describe and explain the benefits to a person of the changes that occur in the body during a physical activity such as a 400m running race.
- (a)Describe and explain the benefits to a person of the changes that occur in the body during a physical activity such as a 400m running race.[8]
- (b)Explain why, after this type of physical activity, a person remains out of breath for several minutes.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2016). The mark or mark type is shown in brackets.
- [8] adrenaline;
- glycogen to glucose ;
- liver/muscles (in context of adrenaline effect);
- boosts blood glucose/sugar levels;
- fast(er) heart beat ;
- better/faster circulation;
- more oxygen + to muscles ;
- more glucose + to muscles ;
- faster respiration/faster metabolism/more energy released;
- faster/deeper breathing;
- more O2 into blood;
- better removal of CO2;
- reference to sweating/vasodilation;
- to cool down/lose heat/maintain body temperature ;
- [2] anaerobic respiration ;
- lactic acid;
- removed/broken down/oxidised;
- needs oxygen/reference to oxygen debt ;
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