Nokea
Which cells in the small intestine may help protect the intestinal epithelium from bacteria?
- A. absorptive cells
- B. goblet cells
- C. granular cells
- D. endocrine cells
Correct Answer: C
Rationale: Granular cells, also known as Paneth cells, produce antimicrobial peptides to protect the intestinal epithelium from bacteria. These peptides have antimicrobial properties that help prevent bacterial overgrowth and maintain intestinal homeostasis. Absorptive cells are primarily responsible for nutrient absorption, while goblet cells secrete mucus for lubrication. Endocrine cells produce hormones that regulate various physiological processes. Therefore, the correct answer is C, as granular cells play a direct role in protecting the intestinal epithelium from bacteria.
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The nurse is caring for a patient with chronic kidney disease. Which of the following laboratory results should the nurse prioritize?
- A. Potassium level of 3.5 mEq/L
- B. Blood urea nitrogen (BUN) level of 18 mg/dL
- C. Serum creatinine level of 4.0 mg/dL
- D. Hemoglobin level of 12 g/dL
Correct Answer: C
Rationale: The correct answer is C: Serum creatinine level of 4.0 mg/dL. This is prioritized as high serum creatinine indicates impaired kidney function in chronic kidney disease. Elevated creatinine levels suggest decreased glomerular filtration rate, which is crucial in monitoring kidney function. Option A (Potassium level of 3.5 mEq/L) may be important due to the risk of hyperkalemia in kidney disease, but it is not as critical as monitoring kidney function. Option B (BUN level of 18 mg/dL) is within normal range and typically fluctuates based on diet and hydration status. Option D (Hemoglobin level of 12 g/dL) is important but not the priority in this case.
Which one of the following enzymes is not part of the enzymatic component of the pancreatic juice?
- A. amylase
- B. lipase
- C. nucleases
- D. chymotrypsin
Correct Answer: D
Rationale: The correct answer is D: chymotrypsin. Chymotrypsin is not part of the enzymatic component of pancreatic juice. Pancreatic juice contains amylase for carbohydrate digestion, lipase for fat digestion, and nucleases for nucleic acid digestion. Chymotrypsin is produced in the pancreas but is not secreted directly into the pancreatic juice. It is released in an inactive form that is activated in the small intestine. Therefore, chymotrypsin is not directly involved in the initial breakdown of nutrients in the pancreatic juice.
A large number of children at a public school have developed profuse diarrhea and bloody stools. The school nurse suspects food poisoning related to food from the school cafeteria and requests analysis and culture of which food?
- A. Chicken
- B. Ground beef
- C. Commercially canned fish
- D. Salads with mayonnaise dressing
Correct Answer: B
Rationale: Ground beef is commonly associated with foodborne illnesses caused by E. coli, which can result in bloody diarrhea.
The finger-like extensions inside the small intestine are called _____ and increase the surface area.
- A. microvilli
- B. villi
- C. lacteals
- D. lumens
Correct Answer: B
Rationale: The correct answer is B: villi. Villi are finger-like projections inside the small intestine that increase the surface area for nutrient absorption. They contain blood vessels and lacteals. Microvilli (A) are tiny projections on the surface of villi that further increase surface area. Lacteals (C) are lymphatic vessels within villi that absorb fats. Lumens (D) refer to the inner space of a tubular structure and are not the finger-like extensions inside the small intestine.
It is correct to say that:
- A. HCL converts pepsin into pepsinogen.
- B. IF is essential for vitamin K absorption.
- C. Saliva contains alpha amylase.
- D. Myenteric plexus controls GIT secretion.
Correct Answer: C
Rationale: The correct answer is C: Saliva contains alpha amylase. Saliva does indeed contain the enzyme alpha amylase, which helps in the breakdown of carbohydrates in the mouth. This is a well-established fact in human physiology.
Explanation for why other choices are incorrect:
A: HCL converts pepsin into pepsinogen - This statement is incorrect as pepsinogen is converted into pepsin by the acidic environment in the stomach, not the other way around.
B: IF is essential for vitamin K absorption - This is also incorrect. Intrinsic factor (IF) is essential for the absorption of vitamin B12, not vitamin K.
D: Myenteric plexus controls GIT secretion - While the myenteric plexus is involved in regulating gastrointestinal motility, it is not primarily responsible for controlling secretion in the gastrointestinal tract.