The correct option is A Ileum is a highly coiled part
Small intestine is divided into three regions: duodenum, jejunum and ileum.
The duodenum is the initial C-shaped region of the small intestine.
Jejunum is a long coiled middle portion of the small intestine.
Ileum is the final portion of the small intestine and it is highly coiled.
Ileum opens into the caecum (first region of the large intestine).
Vermiform appendix arises from the caecum. Vermiform appendix is a vestigial organ in humans.
The wall of the alimentary canal possesses four layers:
Serosa, muscularis, sub-mucosa and mucosa.
Serosa is the outermost layer of the alimentary canal and is made up of epithelial tissue.
Mucosa is the innermost layer lining the lumen of the alimentary canal.