QuestionSBA
QuestionChoice
The afferent arteriole vasoconstricts in high blood pressure due to the influx of calcium via stretch-mediated calcium channels. This results in decreased renin secretion.
10023527
c
Afferent arteriole vasodilates and decreases renin secretion
QuestionChoice
Even though the afferent arteriole vasoconstricts in high blood pressure, there is decreased renin secretion which reduces the effects of the renin-angiotensin-aldosterone (RAAS) system and subsequently reduces blood pressure.
10023526
b
Afferent arteriole vasoconstricts and increases renin secretion
QuestionChoice
The increased blood pressure activates Ca2+ stretch-sensitive channels, causing an influx of calcium and leading to smooth muscle contraction in the afferent arteriole. This vasoconstriction causes renin secretion to be reduced.
10023525
a
Afferent arteriole vasoconstricts and reduces renin secretion
QuestionChoice
The afferent arteriole vasoconstricts in high blood pressure due to the influx of calcium via stretch-mediated calcium channels. This results in decreased renin secretion, not increased renin secretion. This is because the RAAS system will further increase the blood pressure, which is not what the patient needs if his blood pressure is already high.
10023528
d
Afferent arteriole vasodilates and increases renin secretion
QuestionChoice
Even though the afferent arteriole does vasoconstrict, there is a decrease in renin secretion. As this patient's blood pressure is high, the RAAS system needs to be reduced. This is because when the RAAS system is activated it causes an increase in blood pressure.
10023529
e
Afferent arteriole vasoconstricts and there is no change in renin
Concept
Chapter
2693
3952
Endocrine function of the kidney
Topic
168
Renal Physiology
17103
A 66-year-old male comes to see the GP about his high blood pressure. The GP measures his blood pressure and it is 174/118mmHg. The GP is worried about this patient's kidney function due to his high blood pressure.

What happens to the afferent arteriole and renin secretion when blood pressure is high?
a