Tag: the muscular system and digestive system in human beings

• The process of digestion begins from the mouth itself and gets completed in small intestine.
• Stomach plays a key role in the digestion of food. It has gastric glands which secrete gastric juices needed to break down food to simple nutrients and thereby contributing to digestion.
• There are different hormones in our body that has different functions. For example, there could be pH changes associated with different types of food. This pH change stimulates the secretion of a hormone called gastrin which induces the production of digestive juices. But it is not directly connected to the digestion process.
• Water is present in cell, organs and tissues to help regulating temperature and maintaining body functions.
• Absorbed food enters the blood stream and is taken to different parts of the body.

• William Beaumont revealed the functioning of human stomach in a living person. In 1833, He published his findings in the book, 'The Experiments and Observation of the Gastric juice and Physiology of Digestion'. After 10 years from there, he listed many conclusions about the chemical nature of digestion.
• He primarily discovered that gastric juice is responsible for the breakdown of food into simple nutrients and he also described the movement of stomach during digestion. 
• So, the correct option is B.
  

Digestion is completed in the Ileum because it is the last part of small intestine where all the digestive secretions end. From the large intestine, the process of absorption occurs predominantly.

The saliva contains an enzyme called salivary amylase which hydrolyses starch into maltose. The complete digestion of starch occurs only in the small intestine by the action of pancreatic amylase. The activity of enzymes is strongly affected by several factors, such as temperature and pH.