BI-1772
The digestive system
Biology · Secondary 4 · Easy · The digestive system
A section of the small intestine is observed. Food is being pushed along the gut by peristalsis.
At a point where the food is moving forward, what is the state of the circular muscles in the wall just behind the food bolus?
At a point where the food is moving forward, what is the state of the circular muscles in the wall just behind the food bolus?
- They are relaxed to widen the lumen.
- They are contracted to narrow the lumen.
- They alternate rapidly between contracting and relaxing.
- They are inactive and do not change length.
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