When you have your annual physical,the doctor taps your knee with a tiny hammer and you involuntarily jerk your leg.This is an example of a

Question

Quizplus · Accepted Answer

The involuntary jerk of the leg is a Spinal reflex, specifically the knee-jerk reflex. The tapping of the hammer on the patellar tendon stretches the muscle spindles and activates sensory neurons, which sends a signal to the spinal cord. The spinal cord processes the information and sends a signal back through motor neurons to contract the quadriceps muscle, resulting in the involuntary jerk. This reflex is an example of an involuntary and automatic response that does not require involvement or processing by the brain.

When You Have Your Annual Physical,the Doctor Taps Your Knee