Question

The inner layer of the stomach releases:
A. Water
B. Blood
C. Minerals
D. Digestive juices

Answer 1

The innermost layer of the GI system is mucosa. Mucosa is made up of three layers: epithelium, lamina propria and muscularis mucosa. Digestive system consists of the alimentary canal and associated glands. Alimentary canal starts from the mouth and ends at the anus. It is around 24-26 ft long.

Complete answer:
Mucosa is the innermost layer of the stomach. It is very slippery and helpful in prevention of many linings of the body tissues. Stomach has an extremely acidic environment inside it. And mucosa plays a very important role by protecting the stomach lining from getting destroyed by the acidic environment.
Gastric mucus acts as a barrier and protects the stomach wall within the lumen of the stomach from acid. There are few cells present in the stomach which are parietal cells, oxyntic cells etc. They produce gastric juices, which are also known as “digestive juices”, HCl and enzyme pepsinogen.
Digestive juices will help in the lubrication of food and help in the further digestion and also makes sure that no microbe will be left out with the food. It will turn the food into chyme. The enzyme pepsinogen is in inactivated form. It gets activated by the presence of HCl and gets converted into pepsin. Pepsin helps in the digestion of proteins.

Therefore, the correct answer is option (d).

Note:
The mucosa that is present in the cardiac and pyloric regions of the stomach releases mucus which protects the stomach lining. Mucus is secreted by tall columnar epithelial cells. When the chyme reaches the small intestine, first it is neutralized by addition of base and then it is acted upon by many enzymes released by pancreas, and also by the bile. These all together help in the breakdown of the food and it's better absorption in the small intestine.