describe the function of a oesophagus
Answers
Answer: The esophagus functions to transport masticated and swallowed food boli through the mediastinum from the pharynx Nose, Sinus, Pharynx, and Larynx) to the stomach. In all three species, the esophagus has upper and lower esophageal sphincters at the proximal and distal ends, which prevent retrograde movement of food by contracting and closing the lumen of the esophagus. During swallowing, these sphincters relax to allow forward passage of food. Rodents, unlike humans, cannot vomit. The esophagus in rodents is a straight tube that lies dorsal to the larynx in the cervical region, traverses the thorax to the left of the trachea, and passes through the esophageal hiatus in the diaphragm slightly left of midline. It enters the midpoint of the rodent stomach at the lesser curvature near the limiting ridge (also known as the margo plicatus), the region where the nonglandular forestomach meets the glandular mucosa elevated by thickened forestomach lamina propria . In humans, the esophagus begins at the cricoid cartilage, traverses the thoracic cavity in the posterior mediastinum, and penetrates through the diaphragm for several centimeters before entering the stomach . At the gastroesophageal junction, the nonkeratinizing esophageal squamous mucosa abruptly transitions to compact glandular secretory gastric mucosa. This transition is seen macroscopically as a sharply demarcated squamocolumnar junction, or line of contrast, called the Z-line
Explanation:
the tube through which food passes from your mouth to your stomach
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