AMouth
BStomach
COesophagus
DDeodenum
Answer:
C. Oesophagus
Read Explanation:
The oesophagus (or esophagus) is a muscular tube that connects the pharynx to the stomach.
It is primarily responsible for the transport of food, specifically the bolus, from the mouth to the stomach via rhythmic muscular contractions known as peristalsis.
Unlike other segments of the alimentary canal, the oesophagus does not produce or secrete any digestive enzymes.
Key Characteristics
Epithelial Lining: It is lined with non-keratinized stratified squamous epithelium, which provides protection against abrasion from food particles.
Mucus Secretion: While it lacks digestive enzymes, the oesophagus does contain mucous glands in the submucosa. These glands secrete mucus to lubricate the food bolus, facilitating its smooth passage into the stomach.
Lack of Chemical Digestion: Because no digestive enzymes are produced in the oesophagus, chemical digestion does not occur within this structure.