BI-1782
The digestive system
Biology · Secondary 4 · Medium · The digestive system
In the oesophagus, a bolus of food is moved towards the stomach by peristalsis. What happens to the circular and longitudinal muscles just behind the bolus?
- circular contract, longitudinal contract
- circular contract, longitudinal relax
- circular relax, longitudinal contract
- circular relax, longitudinal relax
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