Edexcel IGCSE Biology 2.36 Peristalsis
Practise explaining peristalsis through gut muscle contractions, including how stimulant laxatives move faeces through the colon.
- Syllabus
- First assessment 2019
- Course
- Biology 4BI1
Exam points
- explain how senna stimulates muscle contractions and peristalsis in the colon
- link peristalsis to movement of faeces or waste through the gut
2.36 Aerobic and anaerobic respiration question 1
A scientist investigates the effect of exercise on breathing rate.
She measures the breathing rate in breaths per minute of two people, P and Q , every 5 minutes for 30 minutes.
This is her method.
- measure their breathing rate every 5 minutes while they exercise for 20 minutes
- measure their breathing rate every 5 minutes for a further 10 minutes while they recover from the exercise
The table shows her results.
Explain why the breathing rates of persons P and Q remain high for five minutes after they have finished exercising.
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