Nokea
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.
You may also like to solve these questions
PYLORUS OF THE STOMACH all true except:
- A. The mucosa is thinner than that of fundus.
- B. Glands are lined with Mucous neck cells
- C. Glans are perpendicular on muscularis mucosa
- D. Pits are deep & wide
Correct Answer: C
Rationale: Pyloric glands are not perpendicular but are coiled and branched, unlike the straighter fundic glands.
Which of the following statements are true about the Pancreatic juice?
- A. Pancreatic juice is acidic.
- B. Pancreatic juice is alkaline.
- C. Pancreatic juice is neutral.
- D. All of the above.
Correct Answer: B
Rationale: Pancreatic juice is alkaline due to its bicarbonate content, which neutralizes the acidic chyme entering the duodenum.
Enzyme pepsin acts upon food at a pH of about-
- A. 1.8 to split proteins
- B. 2 to split carbohydrate
- C. 7 to change protein into peptones
- D. 2 to change protein in amino acids
Correct Answer: A
Rationale: Pepsin works at a pH of about 1.8 to break down proteins into peptides.
The break down products of fat molecules can pass directly through the cell membrane. Why?
- A. Fats are soluble in the membrane because the membrane is made of phospholipids
- B. Fats pass through via a protein pump
- C. Fats pass through via a protein channel
- D. Fats are transported through with a special device called a transporter
Correct Answer: A
Rationale: Fat breakdown products (fatty acids and glycerol) are lipid-soluble and can diffuse through the phospholipid bilayer of cell membranes.
The enzymes present in pancreatic juice are
- A. Amylase, Trypsinogen, Peptidase, Rennin
- B. Trypsinogen, Lipase, Amylase, Procarboxypeptidase
- C. Peptidase, Pepsin, Amylase, Rennin
- D. Maltase, Amylase, Trypsinogen, Pepsin
Correct Answer: B
Rationale: Pancreatic juice contains amylase, lipase, trypsinogen, and procarboxypeptidase for digesting carbohydrates, fats, and proteins.