Concept explainers
Food moves down the GI tract through the action of
- a. cilia.
- b. peristalsis.
- c. Gravity.
- d. microorganisms.
Introduction:
Gastrointestinal tract or digestive tract is responsible for ingesting and digesting the food, absorbing the nutrients and eliminating the waste. Alimentary canal is the passage through which the food passes in our body. This includes mouth, esophagus, stomach, small intestine, large intestine, rectum, and anus.
Answer to Problem 1MCQ
Correct answer:
The food moves down the gastrointestinal tract through the action of peristalsis. Therefore, option (b) is correct.
Option (b) is given as “peristalsis”.
Explanation of Solution
Justify reason for the correct statement:
Peristalsis refers to the movement of food in gastrointestinal tract. It takes place by the contraction of peristaltic muscles that are located within the walls of digestive tract. It begins within the oesophagus after swallowing of food from mouth to the stomach. In stomach, muscular movement is initiated for digestion of food and its movement is more in small and large intestine because the process of absorption and digestion takes place in the large intestine.
Hence, option (b) is correct.
Justify reasons for the incorrect statements:
Option (a) is given as “cilia”.
Cilia are found in intestine and involved in absorption of nutrients from food. Hence, it is a wrong answer.
Option (c) is given as “gravity”.
Gravity is a force that attracts body to center of the Earth and it has no role in gastrointestinal tract. Hence, it is a wrong answer.
Option (d) is given as “microorganisms”.
Microorganisms play an important role in digestion as they are involved in breakdown of indigestible carbohydrates into absorbable forms. Hence, it is a wrong answer.
Hence, options (a), (c), and (d) are incorrect.
The movement of food in gastrointestinal tract is due to movement of peristaltic muscles that are located in walls of digestive tract.
Want to see more full solutions like this?
Chapter 22 Solutions
Microbiology: A Systems Approach
- The bile from the liver is delivered to the _______. a. stomach b. liver c. small intestine d. colonarrow_forwardThe region of the digestive tract most responsible for absorption of nutrients is the: a. stomach b. small intestine c. large intestine d. liverarrow_forwardAlthough the stomach is normally thought of as the major player in the digestive process, the bulk of chemical digestion actually occurs in the a. mouth. b. appendix. c. duodenum. d. large intestine.arrow_forward
- Which of the following are used for mechanical digestion? A. Pancreatic juice B. Saliva C. Bile D. Hydrochloric acid (HCI) E. All of the abovearrow_forwardChemical digestion does not involve… A. stomach acid B. peristalsis C. enzymes D. the salivary glands secreting salivaarrow_forwardThe pyloric sphincter connects the: a. Esophagus and stomach b. Stomach and small intestine c. Stomach and large intestine d. Small intestine and large intestinearrow_forward
- Which of the following are not used for mechanical digestion? A. Pancreatic juice B. Saliva C. Bile D. Hydrochloric acid (HCI) E. All of the above F. None of the abovearrow_forwardThe purpose of Microvilli in the human digestive tract is to: a. kill detrimental bacteria in the esophagus b. emulsify fats c. secrete pepsinogen in the stomach d. absorb nutrients from the small intestine into the bloodstream e. secrete trypsinogen and chymotrypsin into the duodenumarrow_forwardThe food coming out of the stomach is very acidic. It is neutralized and made somewhat alkaline by the action of buffers, especially the bicarbonate buffer, which is secreted in: A. Brunner’s glands in the duodenum B. pancreatic juices C. bile D. all of the abovearrow_forward
- Which of the following is incorrect regarding gastric juice?a. It is provided by the pancreas.b. It contains pepsin to digest protein.c. It has a pH of 2 due to hydrochloric acid.d. It is produced by the gastric glands.arrow_forwardThe most commonly occurring small intestinal obstruction is: a. volvulus. b. diverticulosis. c. adhesions. d. tumor. Don't copy from Googlearrow_forwardWhich of the following is an unregulated process in the digestive tract? a. secretion of cholecystokinin (CCK) by the duodenal mucosa b. absorption of amino acids across the epithelium of the small intestine c. release of bicarbonate ion (HCO3–) by pancreatic duct cells d. peristalsis in the stomacharrow_forward
- Comprehensive Medical Assisting: Administrative a...NursingISBN:9781305964792Author:Wilburta Q. Lindh, Carol D. Tamparo, Barbara M. Dahl, Julie Morris, Cindy CorreaPublisher:Cengage Learning
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax CollegeHuman Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning