Which of the following is NOT found in saliva?
lysozyme
urea and uric acid
electrolytes
protease
The Correct Answer is D
A. Lysozyme: Lysozyme is present in saliva and has antibacterial properties, breaking down bacterial cell walls.
B. Urea and uric acid: These waste products are found in saliva in small amounts.
C. Electrolytes: Saliva contains electrolytes such as sodium, potassium, and bicarbonate.
D. Protease: Proteases (like pepsin or trypsin) are not present in saliva; they are found in the stomach and small intestine.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Potassium ion concentration in extracellular fluid: High levels of extracellular potassium stimulate aldosterone secretion and enhance potassium secretion into the renal tubules for excretion. This is the most direct and critical factor.
B. Intracellular sodium levels: While sodium levels affect membrane potentials, they do not directly regulate potassium secretion.
C. The pH of the intracellular fluid: pH changes can influence potassium distribution between compartments but are not the main driver of secretion.
D. The potassium ion content in the renal tubule cells: This reflects storage, not the signal for secretion. The extracellular fluid concentration is what regulates the process.
Correct Answer is D
Explanation
A. Store fat-soluble vitamins: Hepatocytes store vitamins A, D, E, and K.
B. Detoxify toxic chemicals: Hepatocytes metabolize and detoxify substances like drugs and alcohol.
C. Process nutrients: They metabolize carbohydrates, lipids, and proteins, modifying absorbed nutrients.
D. Produce digestive enzymes: Hepatocytes do not produce digestive enzymes; that is the role of the pancreas and other gastrointestinal organs.
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