A reflex is an automatic, rapid response that doesn't wait for the brain. Tap the tendon and follow the signal through the five parts of the knee-jerk arc.
Tap the tendon
The reflex arcreceptor → effector
The five parts
📷 Reference image
A real labeled figure to compare with the interactive above.
The Reflex Arc — Zhang MJ, Zhu CZ, Duan ZM, Niu X. Department of Cardiology, Second Affiliated Hospital, School of Me, CC BY-SA 4.0 (via Wikimedia Commons)
