Formation of Faeces and Defaecation

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Learning outcomes 

At the and of the lesson, you should be able to:

3. Identify the part of the digestive system where the

formation of faeces takes place. 5. Describe the formation of faeces and problems related

to defaecation.







Faeces After absorption of nutrients has taken place in the small intestine. The intestinal contents enter the colon.

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The intestinal contents are now a mixture of water, undigested food substances and

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Cont… Recovery of water from the undigested remains in the colon results in the formation of faeces, which are now semi-solid waste.

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Faeces also contain dead cells shed from the intestinal lining as well as waste products like

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Figure of large intestine (colon)







Microorganisms vs antibiotics The colon also serves as a habitat for a flourishing population of bacteria.

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The presence of beneficial microorganisms plays an important role in maintaining a stable environment in the alimentary canal.

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Cont… In most cases, the doctor will prescribe antibiotics to treat various infections.

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Bio Facts E. coli is one of the most common intestinal bacteria.

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Defaecation The wall of the colon secretes mucus which binds the faeces and lubricates the movement of faeces along the colon.

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Figure of large intestine (colon)







What is the relationship between these two figure?















Problems related to













Formation of Faeces and Defaecation

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