Assimilation and Egestion -
- The absorbed substances finally reach the tissues which utilise them for their activities.
- This process is called assimilation.
- The digestive wastes, solidified into coherent faeces in the rectum initiate a neural reflex causing an urge or desire for its removal.
- The egestion of faeces to the outside through the anal opening (defaecation) is a voluntary process and is carried out by a mass peristaltic movement.
The egestion of faeces to the outside through the anal opening is called defaecation. Hence, the correct answer is option d.
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