The processes of digestion include six activities: ingestion, propulsion, mechanical or physical digestion, chemical digestion, absorption, and defecation. The first of these processes, ingestion, refers to the entry of food into the alimentary canal through the mouth.
11. What are the basic units of proteins?
a. amino acids b. fatty acids c. nucleic acids d. glycerol
12. What polysaccharide forms an important structural component of the exoskeleton of arthropods? a. cellulose b. chitin c. glycogen d. starch
13. Which of the following is a characteristic of essential amino acids?
- They are manufactured internally in the body by chemical reactions.
- They cannot be reproduced by the body.
c They must be taken with food.
d. All of the above.
14. Which of the following is not an accessory organ of digestion?
a. esophagus b. liver c. pancreas d. salivary glands
15. Which process facilitates the transport of the final products of digestion from the digestive system to the blood? a. circulation b. excretion c. absorption d, secretion
16. Which of the following secretions breaks down large fat molecules into smaller globules?
a. amylase b. bile c. chemotrypsin d. trypsin
17. Which of the following is the correct sequence in the breakdown of food from the mouth to the rectum?
- food – bolus – chyme – feces c. food – chyme – bolus – feces
- bolus – food feces – chyme d. chyme – bolus – dissolved nutrients – feces
18. Which of the following digestive organs secretes maltase, sucrose and lactase?
a mouth b. stomach c. liver cl. small intestine
19, What portion of the small intestine is located right after the stomach?
a jejunum b. pyloric valve c. duodenum d. ileum