Human Digestive System

Fibre (or dietary fiber) is essential for maintaining regular bowel movements and overall digestive health.

The immune system is responsible for controlling infections. When it is compromised or functioning improperly, a minor infection can escalate into a severe condition like bloody diarrhea.

 HCl is present in stomach so this is correct option.

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Celiac disease

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Melena is the passage of tarry black stools due to upper gastrointestinal bleeding, where blood is digested and darkened. Hematuria is blood in urine. Hypovolemia is low blood volume. Hyper apnea is not a standard medical term; likely meant hyperapnea (excessive breathing).

Chyme is the semifluid mass of partly digested food and digestive secretions that is formed in the stomach and intestine during digestion.

Glisson's capsule is the connective tissue sheath that covers the liver and extends into its interior to divide the parenchyma into lobules. It is a defining anatomical feature of the liver.

Pepsin is a gastric enzyme that functions optimally in the highly acidic environment of the stomach, which typically has a pH between 1.5 and 2.0.

Pancreatic juice secretion is regulated by the hormones secretin and cholecystokinin. It is produced by the walls of the duodenum upon detection of acid food, proteins, fats, and vitamins.

The crypts of Lieberkuhn are simple, tubular structures which occur through out the small intestine and involved in th secretion of intestinal juice or succus entericus. 

Any food that contains fat causes the gallbladder to release bile. The higher the fat content of the food or meal, the more bile is released.

The mucous amembrane of intestinal wall is a single layered eptithelium of tall columber cells with interspersed golbelt cells. Thee epithelial cells have microvilli. In between the villi the mucous membrane is profusely folded and the infolding form pit-like simple tubular intestinal glands or crypts of Leiberkuhn. These secrete the intestinal digestive juice called succus entericus. Rennin is component of gastric juice secreted from stomach. It secreted in form of inactive proenzyme called prorennin. It changes the soluble casein proein of milk into insoluble semifluid calcium paracaseinate.Saliva is secreted from salivary glands. The saliva contain ptyalin (salivary amylase) in mammals.