In the human body, one of the essential systems is the digestive system, which breaks down the foods what we eat into nutrients such as proteins, carbohydrates, vitamins and fats. The bloodstream would be absorbed by them. Therefore, it provides the body with energy, repair and growth. Also, the three types of processes that food passes through in the human body are digestion, absorption and elimination. The digestive system prepares the body cells for nutrients through six activities: Ingestion, Mechanical digestion, Propulsion, Chemical digestion, Absorption and Defecation. (NIDDK.NIH.gov)
The digestive system consists of the gastrointestinal (GI) tract also known as the digestive tract or alimentary canal, along with the pancreas, liver and gallbladder. The GI tract consists of large muscles with the long and twisting tube that connects from the mouth to the anus. It consists of the oral cavity, pharynx, oesophagus, stomach, small intestine and large intestine and anus. In addition, the teeth, gallbladder, pancreas, liver, tongue and salivary glands are the accessory organs of the digestive system. Many of these organs secrete fluids into the digestive tract. (NIDDK.NIH.gov) The first digestion process of the human body called ingestion, which is divided into two parts: the mechanical digestion and the chemical digestion. The
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In this case, one sphincter opens and makes the oesophagus able to propel food to the stomach by coordinated contractions and relaxations of its muscular lining (peristalsis). After swallowing, the sphincters relax involuntarily to allow drink or food to through from the oral cavity into the stomach. When there is no swallowing action, the muscles would close rapidly to prevent the swallowed food or liquid from leaking out of the stomach back into the oesophagus or into the mouth.