Anaerobic Respiration (Cambridge O Level Biology)

Researchers in the Czech Republic investigated oxygen consumption in horses.

They measured the oxygen consumption of the horses while they were exercising at four different paces: walking, trotting, cantering and galloping.

The results are shown in Fig. 1.

Fig. 1

Calculate the percentage increase in the average rate of oxygen consumption as the horses change from walking to trotting.

Show your working.

 ____________% 

The researchers also calculated the oxygen debt for each type of exercise.

They found that the horses developed a larger oxygen debt when they exercised by galloping and cantering rather than when they walked.

Explain why the horses developed an oxygen debt when they exercised.

Describe how the horses would recover from an oxygen debt when they stop exercising.

Compare anaerobic respiration in muscles and anaerobic respiration in yeast  

A person leaves a room and runs very fast for 200m. When the person stops running, his breathing rate and his heart rate remain high for several minutes.

Explain why the person’s breathing rate and heart rate remain high.

The run results in changes in the skin involving the blood vessels and the sweat glands.

Describe what happens to the blood vessels and sweat glands during the run.

Explain why these changes happen.

Yeast cells can respire anaerobically.

Biotechnology makes use of this.

State two ways that the products of anaerobic respiration in yeast are used by humans.