Stomach

Stomach

The stomach is a muscular organ located on the left side of the upper abdomen. It starts from the end of esophagus and ends on duedenum. The food enters the stomach through a muscular valve called lower esophagus sphincter.
     The stomach secrets acid and enzymes that digest the food. Ridges of muscle tissue called rugger line the stomach. The stomach muscles contract periodically, churning food to help digestion. The food exits through another muscular valve known as pyloric sphincter. It is a flexible muscular sac. Capacity is 1.5 L .
Functions:

1. stores food.
2. Mixes gastric juice.
3. Secretes HCl, enzymes and substances.

Parts of Stomach: 
Followings are the part os stomach

• Cardia
• Fundus
• Body
• Antrum

Layers of Stomach:

•  Mucosa
• Submucosa
• Muscularis
• Serosa

Cell and their Secretions:

• Parietal cells: HCl
• Chief (peptic) Cells: Pepsinogen
• Mucous Neck Cells: Mucosa
• G Cells: Gastrin