Nokea
What are the advantages of chewing food at the start of digestion?
- A. increasing surface area
- B. lubricating food
- C. making food soluble
- D. all of the above
Correct Answer: D
Rationale: Chewing increases the surface area for enzyme action, lubricates food with saliva, and helps dissolve food particles.
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Lactose composed of :-
- A. Glucose + galactose
- B. Glucose + fructose
- C. Glucose + glucose
- D. Glucose + mannose
Correct Answer: A
Rationale: Lactose is a disaccharide made of glucose and galactose.
Esophagus, all true except:
- A. Muscular tube that conveys the ingested food from the pharynx to the stomach
- B. Esophagus shows longitudinal folds that help in its expansion during swallowing.
- C. Its muscularis mucosa is formed entirely of smooth muscles.
- D. Its mucosa have no glands in the entire length.
Correct Answer: D
Rationale: The esophageal mucosa contains mucous glands in the submucosa, especially in the upper and lower regions, not none along its length.
The end product of digestion of starch which is absorbed into the bloodstream is:
- A. amino acid
- B. fatty acid
- C. glucose
- D. sucrose
Correct Answer: C
Rationale: Starch is broken down into glucose by enzymes like amylase and maltase, which is then absorbed into the bloodstream.
Homeostasis is best described as:
- A. The process by which we change our external environment so that we are comfortable
- B. A process that uses hormones to adjust our bodily functions
- C. A process by which nerves and hormones operate together to keep the internal environment stable no matter what the external conditions
- D. A process by which the nerves make us respond to danger
Correct Answer: C
Rationale: Homeostasis maintains internal stability using nerves and hormones despite external changes.
The muscular tube that extends from the mouth to the anus is called:
- A. the gullet
- B. the intestine
- C. the colon
- D. the alimentary canal
Correct Answer: D
Rationale: The alimentary canal, also known as the digestive tract, is the continuous muscular tube extending from the mouth to the anus, encompassing all digestive organs.