Discussion
Which of the following statements about large intestine are correct ?
A. It includes caecum, colon, rectum and anal canal.
B. The last stages of chemical digestion occur in the large intestine through bacterial action. Substances are further broken down and some vitamins are synthesized.
C. The large intestine absorbs water, ions and vitamins.
D. The elimination of faeces from the rectum is called defecation. Defecation is a reflex action aided by voluntary contractions of the diaphragm and abdominal muscles.
Choose the correct answer from the options given below :
Answer: D
All four statements are correct, so the answer is A, B, C and D.
The large intestine consists of the caecum, colon, rectum and anal canal (A). Its bacteria carry out the last stages of digestion, fermenting leftover material and producing some vitamins, such as vitamin K and some B vitamins (B). It absorbs water, ions such as sodium, and these vitamins, turning the remaining material into faeces (C).
Defecation, the elimination of faeces from the rectum, is a reflex triggered by the stretching of the rectal wall, aided by voluntary contraction of the diaphragm and abdominal muscles (D). Since all four hold, every option leaving one out is incomplete.
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