Step-by-step explanation:
Food is ingested into the mouth where mechanical breakdown begins using teeth to chew the food. While in the mouth, chemical digestion of carbohydrates and lipids begin, by enzymes from salivary glands. Lipids are digested by an enzyme called _14_ while carbohydrates are digested by an enzyme called _13_. From the mouth, the food goes in the form of a bolus to the back of the mouth, entering the _18_, then it goes down to the laryngopharynx before entering the _4_. Food goes down the esophagus as a result of _17_ (contractions of smooth muscles in the wall of the esophagus). The food then passes through the lower esophageal sphincter to enter the _10_.
While in the stomach, proteins are digested by the enzyme called _9_. After about two hours, the food, now referred to as chyme, goes through the pyloric sphincter to enter the _8_. In this region, secretions from the pancreas contain all the digestive enzymes that digest the four organic compounds. The enzyme _12_ digests carbohydrates while the enzyme _7_ digests lipids, _11_ digests nucleic acids while _1_ digests proteins. Completion of digestion by brush border enzymes occur when the food goes to the second part of the small intestine, called _16_, then to the third part called _6_. Digestion products are absorbed into the blood. Water is absorbed by _15_ following sodium active transport. Glucose and most amino acids are absorbed by _3_ while fatty acids are absorbed by _5_. The indigestible material passes through the ileocecal valve to enter the _2_. From there, water is reabsorbed and the indigestible material becomes semisolid and comes out of the body as feces.
1. pancreatic protease
2. large intestine
3. jejunum
4. stomach
5. simple diffusion
6. ileum
7. pancreatic lipase
8. duodenum
9. pepsin
10. oropharynx
11. pancreatic nuclease
12. pancreatic amylase
13. salivary amylase
14. salivary lipase
15. osmosis
16. secondary active transport
17. peristalsis
18. esophagus