Nokea
A filling defect on a barium examination of the gastrointestinal tract means:
- A. the lumen is locally dilated or there is an outpouching
- B. something protruding into the lumen displaces the barium
- C. both
- D. neither
Correct Answer: B
Rationale: The correct answer is B because a filling defect on a barium examination indicates that something is protruding into the lumen, displacing the barium. This means there is an abnormality or mass present that prevents the barium from flowing uniformly. Choice A is incorrect because a filling defect does not necessarily indicate local dilation or outpouching. Choice C is incorrect because it combines both A and B, which is not always the case. Choice D is incorrect as there is indeed something causing the barium to be displaced in the lumen.
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Which of the following is a common risk factor for gallstones?
- A. High-fat diet
- B. Advanced age
- C. Gender (female)
- D. Family history of gallbladder disease
Correct Answer: C
Rationale: The correct answer is C: Gender (female). Women have a higher risk of developing gallstones due to hormonal factors, such as estrogen increasing cholesterol levels in bile. This imbalance can lead to gallstone formation. Advanced age (B) is a risk factor but not as common as gender. While a high-fat diet (A) can contribute to gallstone formation, it is not a primary risk factor. Family history (D) can increase the likelihood of gallstones, but it is not as common as being female.
The three pairs of extrinsic salivary glands are:
- A. parotid sublingual and ethmoidal
- B. Parotid buccal and submaxillary
- C. Parotid sub mandibular and buccal
- D. Parotid Submandibular and sublingual
Correct Answer: D
Rationale: The correct answer is D because the extrinsic salivary glands are the parotid, submandibular, and sublingual glands. The parotid gland is located near the ear, the submandibular gland is under the mandible, and the sublingual gland is under the tongue.
A is incorrect because the ethmoidal gland is not an extrinsic salivary gland. B is incorrect because the buccal gland is not an extrinsic salivary gland. C is incorrect because the buccal gland is not an extrinsic salivary gland; it is a minor salivary gland located in the cheek.
What is the role of the villi in the small intestine?
- A. secreting digestive enzymes
- B. absorbing nutrients
- C. producing bile
- D. producing mucus
Correct Answer: B
Rationale: The correct answer is B: absorbing nutrients. Villi are finger-like projections in the small intestine that increase surface area for absorption of nutrients. They contain blood vessels and lacteals that absorb nutrients like glucose and amino acids. Villi do not secrete digestive enzymes (choice A), produce bile (choice C), or produce mucus (choice D). Digestive enzymes are produced by the pancreas and bile is produced by the liver. Mucus is produced by goblet cells in the intestine.
Jason, a 22 y.o. accident victim, requires an NG tube for feeding. What should you immediately do after inserting an NG tube for liquid enteral feedings?
- A. Aspirate for gastric secretions with a syring
- C. Begin feeding slowly to prevent cramping.
- D. Get an X-ray of the tip of the tube within 24 hours.
Correct Answer: A
Rationale: The correct answer is A because aspirating for gastric secretions ensures proper tube placement in the stomach, reducing the risk of aspiration pneumonia. Choice B is irrelevant and doesn't address the immediate post-insertion step. Choice C is incorrect as starting feeding immediately can lead to complications if the tube is not in the correct position. Choice D is incorrect as X-ray verification is not needed immediately after insertion.
Most of the enzymes produced in the large intestine and the formation of Vitamin K occurs in
- A. Goblet cells.
- B. simple columnar cells.
- C. teniae coli.
- D. bacteria.
Correct Answer: D
Rationale: The correct answer is D: bacteria. Enzymes in the large intestine are primarily produced by the gut microbiota, which are bacteria residing in the colon. These bacteria play a crucial role in the breakdown of complex carbohydrates and the production of certain vitamins, including Vitamin K. Goblet cells (A) produce mucus, simple columnar cells (B) are involved in absorption, and teniae coli (C) are muscle bands in the colon - none of which are directly responsible for enzyme production or Vitamin K synthesis in the large intestine.