This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Which of the following does golgi tendon organ detect? 
Select and explain. 
A. Muscle Tension, B. Dynamic muscle length, C. Static muscle length, D. Muscle action
A: Muscle Tension
Answer: A: Muscle Tension 
Explanation: Ans. A. Muscle Tension(Ref.: Ganong 25/e p232; Guyton 13/e p697, 701).Golgi tendon organ senses muscle tension.The Golgi organ (also called Golgi tendon organ, GTO, tendon organ, neurotendinous organ or neurotendinous spindle) senses changes in muscle tension.It is a proprioceptive sensory receptor organ that is at the origin and inseion of skeletal muscle fibers into the tendons of skeletal muscle.It provides the sensory component of the Golgi tendon reflex.