Anatomy & Physiology Question #46
Which stimulates the release of renin from the kidneys?
- A decline in renal blood flow
- Parasympathetic stimulation
- Sympathetic stimulation
- Low red blood cell count
The correct answers are A and C. In parasympathetic stimulation the decrease in renal arterial pressure results in decreased intracellular concentration of calcium. This increases renin release from the juxtaglomerular cells. This stimulation causes vasoconstriction, which results in reduced glomerular filtration or GFR (glomerular filtration rate). Parasympathetic stimulation and a low red blood cell count do not stimulate the release of renin from the kidneys.