Which of the following sensory receptors can induce muscle relaxation when activated?

The Golgi tendon organs are specialized sensory receptors located in the tendons of muscles. They play a crucial role in the body's ability to monitor and regulate muscle tension. When activated, these receptors help to sense the amount of tension or force exerted by a muscle.

The primary function of the Golgi tendon organs is to inhibit muscle contraction and promote relaxation. This response is part of a protective mechanism, preventing excessive force that could lead to injury. They achieve this by triggering a reflex known as the "inverse myotatic reflex," which inhibits the activity of the muscle and promotes relaxation, allowing for a safe range of motion and reducing the risk of strain.

In contrast, the other sensory receptors mentioned serve different functions. Pacinian corpuscles are involved in sensing deep pressure and vibration, Ruffini endings detect stretch and joint position, and muscle spindle fibers are responsible for sensing changes in muscle length and the rate of that change. None of these receptors induce muscle relaxation in the same way that Golgi tendon organs do, which is why the latter is recognized as the correct choice in this context.