Gut contents must be moved along the digestive tract in order for food to be processed and ultimately waste excreted. Which of the following correctly describes a functional benefit of the control of the rate (transit time or speed) of movement of gut contents through a gut compartment.单项选择题

A

The movement through the ileum is typically slower than through the colon which has the benefit of allowing time for complete absorption of available nutrients

B

Movement of food down the oesophagus is typically slower than movement through the stomach which has the benefit of making it easier to prevent escape of stomach acid

C

The passage of digesta through the colon is typically faster than any other compartment which has the benefit of removing toxic wastes and microbes before damage occurs

D

The movement through the ileum is typically faster than through the colon which has the benefit of limiting microbial overgrowth

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Which of the following statements about the role of saliva in the monogastric digestive tract is FALSE:

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