A fetus develops without macula densa in its nephrons. Which of the following will occur as a result?
A. The ability to detect sodium, potassium, and chloride ions in the nephron loop and secrete renin in response will be lost.
B. Fluid cannot pass from the glomerular capillaries into the Bowman's capsule, so blood cannot be filtered.
C. Renin will be able to convert angiotensinogen into angiotensin I, but angiotensin I cannot be converted into angiotensin II.
D. Renin secretion in response to renal baroreceptors during low blood pressure conditions cannot occur.
Answer: A
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