Physiology · Interactive lesson · Free
RAAS, without memorising a wall of text.
Follow the renin–angiotensin–aldosterone system, predict what happens next, build the pathway yourself, then apply it clinically. No login and no AI call while you learn.
Explore the mechanism
What happens when renal perfusion falls?
Reduced renal perfusion
The kidney senses a fall in effective renal perfusion. Juxtaglomerular cells increase renin release.
Predict first
Before revealing it: if angiotensin II rises, what should happen to vascular tone and aldosterone signalling?
Build the pathway
Put the RAAS pathway in the correct physiological order.
Quick challenge
A patient has reduced effective circulating volume. Which response best fits activation of RAAS?
Quick challenge
Why can RAAS become maladaptive in chronic heart failure?
Mastery check
If you can explain why reduced renal perfusion causes renin release, rebuild the pathway, and connect chronic activation to congestion, you understand the mechanism rather than just the acronym.
Educational scope: this lesson teaches the core physiological mechanism. Drug selection and patient-specific treatment require current clinical guidance and individual assessment.