What is the primary function of the Loop of Henle in the nephron?
Concentration of urine
Filtration of blood
Regulation of blood pH
Excretion of waste products
The Correct Answer is A
A. Concentration of urine: The Loop of Henle creates a concentration gradient in the renal medulla (via the countercurrent multiplier system), which allows the kidney to reabsorb water and produce concentrated urine.
B. Filtration of blood: This is the function of the Glomerulus/Bowman’s capsule.
C. Regulation of blood pH: This occurs primarily in the proximal and distal convoluted tubules.
D. Excretion of waste products: While waste passes through it, the primary unique structural function of the Loop is the osmotic gradient.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. It enhances the metabolism of vitamin B12: Intrinsic factor is strictly for transport and absorption, not metabolism in the liver.
B. It leads to decreased absorption of vitamin B12, causing deficiency: Vitamin B12 cannot cross the intestinal lining in the ileum on its own; it must be bound to intrinsic factor to be recognized and absorbed.
C. It boosts the storage of vitamin B12 in muscle tissues: B12 is primarily stored in the liver, and intrinsic factor does not affect storage mechanisms.
D. It increases the excretion of vitamin B12 through urine: If B12 isn't absorbed, it is excreted in the stool, not the urine.
Correct Answer is A
Explanation
A. No one: To maintain patient confidentiality and data security (HIPAA compliance), passwords must never be shared. Every user must use their own unique credentials so that actions in the electronic health record (EHR) can be audited.
B. Information system representative: IT staff can reset passwords but do not need to know the user's current password.
C. The unit clerk: Sharing with coworkers is a violation of security protocols and puts the nurse's professional license at risk.
D. The nurse manager: Administrative authority does not grant the right to use another employee's digital signature or login.
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