A client has been diagnosed with problems with the juxtaglomerular apparatus. The client is eager to know how this could affect health. What is the best explanation to the client of the function of the juxtaglomerular apparatus?
A) Secretes aldosterone
B) Promotes water retention
C) Regulates blood pressure
D) Produces erythropoietin
C
Feedback:
The nurse should explain that the juxtaglomerular apparatus (JGA) consists of specialized glandular cells responsible for maintaining blood pressure (BP). The JGA secretes renin, not erythropoietin. JGA also does not directly secrete aldosterone. Renin stimulates the formation of angiotensin I, which, in the presence of a converting enzyme, will change to angiotensin II. Angiotensin II causes blood vessels to constrict, directly raising BP; and stimulates the adrenal cortex to secrete aldosterone. Aldosterone, in turn, promotes sodium and water retention, not JGA.
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