#feedback

3 articles

Hormones: The Body's Chemical Messengers

How hormones broadcast slow, body-wide chemical signals through the blood, why only cells with the right receptor respond, and how negative feedback keeps every level in range.

10 min read·Jul 28, 2026

Medicine

Blood Pressure and Circulation

Why a blood-pressure reading has two numbers, how elastic arteries smooth a pulsing heart into steady flow, and why a fourth-power law makes tiny vessels the body's master control valves.

9 min read·Jul 13, 2026

Medicine

Glucose and Insulin: A Feedback Loop

Blood glucose stays inside a startlingly narrow band whether you have just eaten or not eaten for a day. The reason is a negative feedback loop with a sensor, a controller, and an effector — and diabetes is what happens when different parts of that loop fail.

10 min read·Jul 8, 2026