Which of the following does NOT describe the juxtaglomerular complex?
It regulates the rate of filtrate formation.
Its macula densa cells produce aldosterone.
Its granular cells produce rennin.
It helps control systemic blood pressure.
The Correct Answer is B
A. It regulates the rate of filtrate formation: The juxtaglomerular complex (JGC) helps control glomerular filtration rate (GFR) by monitoring filtrate content and flow.
B. Its macula densa cells produce aldosterone: Macula densa cells sense sodium concentration but do not produce aldosterone. Aldosterone is secreted by the adrenal cortex.
C. Its granular cells produce renin: Granular (juxtaglomerular) cells release renin in response to low blood pressure or sodium.
D. It helps control systemic blood pressure: Through renin release and the RAAS system, the JGC helps regulate blood pressure.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Urine output will decrease: Vasodilation of efferent arterioles lowers glomerular pressure, leading to a lower GFR and reduced urine output.
B. Glomerular filtration rate will decrease: A wider efferent arteriole reduces resistance, decreasing the pressure inside the glomerulus, hence lowering GFR.
C. Systemic blood pressure will decrease: Local vasodilation of the efferent arteriole does not significantly affect systemic blood pressure. Systemic pressure is influenced more by cardiac output and total peripheral resistance, not glomerular arteriole tone.
D. Net filtration pressure will decrease: Lower glomerular capillary pressure results in reduced net filtration pressure (NFP).
Correct Answer is B
Explanation
A. Citric acid (Krebs) cycle: This occurs in the mitochondria, which RBCs do not possess.
B. Glycolysis: RBCs rely entirely on anaerobic glycolysis in the cytoplasm for ATP production due to their lack of mitochondria.
C. Aerobic respiration: This requires mitochondria, which are absent in RBCs.
D. Electron transport chain: This also occurs in the mitochondrial membrane, and RBCs can’t perform this process.
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