A summary of the digestive system from the perspective of ingested food: The food is first ingested through the oral cavity which includes the lips, teeth, tongue, and salivary glands which help break down carbohydrates and lubricates the passage of food down from the pharynx to the esophagus to the stomach. The esophagus is a tube structure that is a passageway for food to go to the stomach. It enters the stomach which is inferior to the esophagus through a muscular valve called the lower esophageal sphincter. The stomach muscles contract with a wave-like muscle contraction called peristalsis (“Your Digestive System & How it Works,” n.d.) The food then leaves the last part of the stomach called the pylorus. The cells of the stomach secrete HCl and intrinsic factor which kills the microbes in the ingested food. This HCl and the enzymes do not damage the stomach because the outer lining of the stomach is covered by a layer of mucosa.
- Summer '20
- Digestive System