Question

Which is the correct sequence of parts in the human alimentary canal?

• A. Mouth → stomach → small intestine → oesophagus → large intestine
• B. Mouth →oesophagus → stomach → large intestine → small intestine
• C. Mouth → stomach → oesophagus → small intestine → large intestine
• D. Mouth → oesophagus → stomach → small intestine → large intestine

Answer 1

The correct option is D

Mouth → oesophagus → stomach → small intestine → large intestine

The correct option is D.

Explanation of correct option:

1. From the mouth to the anus, the human alimentary canal is a contiguous tube.
2. It comprises the mouth, pharynx, esophagus, stomach, small intestine, and large intestine.
3. Digestion starts in the mouth with the breakdown of large pieces of food into smaller particles.
4. From the mouth, the food enters the pharynx.
5. The pharynx receives a bolus from the mouth and passes it into the esophagus.
6. The esophagus is the portion of the alimentary canal that connects the pharynx to the stomach.
7. The stomach store, dissolve, and partially digest the food particles and it regulates the rate at which the stomach's contents empty into the small intestine.
8. From the stomach, the food enters the small intestine (including the duodenum, jejunum, and ileum).
9. The small intestine completes the digestion of carbohydrates, proteins, and lipids.
10. The small intestine absorbs about 90% of nutrients and water that pass through the digestive system.
11. The large intestine is present after the small intestine.
12. The large intestine comprises of cecum, colon, and rectum.
13. The large intestine absorbs some water, ions, and vitamins, and it also stores indigestible material until it is eliminated at the anus.

Final answer: Mouth → esophagus → stomach → small intestine → large intestine is the correct sequence of parts in the human alimentary canal.