Q140 / 180 · NEET 2020 (Phase 1) · Zoology

Identify the correct statement with reference to human digestive system.

  • A
    Serosa is the innermost layer of the alimentary canal
  • Correct answer
    B
    IIeum is a highly coiled part
  • C
    Vermiform appendix arises from duodenum
  • D
    IIeum opens into small intestine

Solution

Serosa is the outermost layer of the alimentary canal while mucosa is the innermost layer.

Ileum (highly coiled, the longest portion): Longest part of the alimentary canal (3.5 m long). It contains a large number of villi (microvilli) which helps in the absorption of food. Ileum, the last part of the small intestine leads into the large intestine.

The appendix is attached to the caecum which is a vestigial organ and its infection leads to appendicitis. 

Hence, the correct answer is option: 'B'.

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