Question

what is Golgi tendon organ (GTO) and how it is activated
What is the Proprioceptor for the stretch reflex

Answer 1

The Golgi tendon organ (GTO) (also called Golgi organ, tendon organ, neurotendinous organ or neurotendinous spindle) is a proprio ceptive sensory receptor organ that senses changes in muscle tension. It lies at the origins and insertion of skeletal muscle fibers into the tendons of skeletal muscle. The "stretch reflex," for example, is activated when theproprioceptors sense too muchstretch or force on a muscle or tendon. To resist an unsafe change in muscle length that may lead to a torn muscle or tendon, the reflex causes the stretchedmuscle to contract, shorten, and protect the muscle or tendon from injury.