Questions & Answers

The innermost layer of the stomach is called
A. Serosa
B. Muscularis mucosa
C. Lamina propria
D. Mucosa

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Hint: A part of human physiology is digestion and absorption. The alimentary canal and the digestive glands are two main parts of the human digestive system. Extending from the mouth to the anus, the alimentary canal is a muscular tube. Mouth, pharynx, oesophagus, stomach, stomach, small intestine, large intestine, and the anus are the components of the human digestive system. This layer also lined eyes, nose, lungs, etc.

Complete answer:
Cardiac part, fundus, body and the pyloric are the four major parts of the stomach. Air or gas fills up the fundus, the body forms the main part of the stomach and the posterior part of the stomach is known as the pyloric body. On the outer walls of the organs of the abdominal cavity, there is a smooth membrane present which is called the serosa. The thin layer of muscles present in the gastrointestinal tract is known as the muscularis mucosa. The lamina propria is a thin layer of connective tissue that lines the respiratory tract, gastrointestinal tract and urogenital tract.
The widest organ of the alimentary canal is the stomach and is J-shaped organ. The lumen of the alimentary canal is lined by the innermost layer known as the mucosa. The mucosa is named so because it secretes mucus. Mucus helps in the lubrication of the inner lining of the gut. Rugae or irregular folds are formed by mucosa. The three layers of the mucosa are muscularis mucosa, lamina propria and epithelium. Mucosa mostly has an endodermal origin and is present in eyes, ears, nose internals and inside the mouth. One of the major functions of the mucosa is to maintain the moist condition of the tissue. Nutrient absorption and transformation is performed by the mucosa. The endometrium is the mucous membrane that is present in the uterus. Unstriped outer longitudinal and inner circular muscle fibres are present in muscularis mucosa. Loose connective tissues, blood vessels, glands and lymphoid tissues constitute the lamina propria. Gastric glands in the stomach, villi and intestinal glands are formed by the epithelium.
Thus, the correct answer is option D.

Note: The mucus is defined as a thick protective fluid. The mucous membrane helps in the prevention of the entry of pathogens and dirt into the body. The stomach acid is protected by the mucosa itself.