Answer :- D. Systemic blood pressure decreases; granular
cells
Explanation :- granular cells also known as JG cell a modified
muscle cell that secrete renin ( endocrine hormone ) in response to
Drop in afferent arteriole blood pressure.
After the releasing of renin it goes into the blood and initiate
a chemical reaction .
They covert Angiotensinogen into Angiotensin 1after that
Angiotensin-1 combine with another enzyme called, Angiotensin
converting enzyme which is found in the lungs and blood stream and
convert into the Angiotensin-2 which
stimulates  sympathetic nervous system that cause
vasoconstriction result is  afferent arteriole pressure
increases...Thanks dear student
