An obstruction in the afferent arteriole would reduce the flow of blood into thea. glomerulus. b. renal artery. c. macula densa. d. efferent arteriole. e. arcuate artery.

a. glomerulus

Explanation:

Afferent arterioles are the blood vessels that bring the blood to the nephrones of the kidneys. They branch into the capillaries of the glomerulus, the beginning of the nephron.

Afferent arterioles are responsible for the regulation of the blood pressure via  tubuloglomerular feedback mechanism.

When blood flow is reduced:

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