Ia sensory fibers are activated in response to
A) contraction of muscle fibers.
B) stretching of Golgi tendon organs.
C) stretching of muscle spindles.
D) input from Ib fibers.

Question

Quizplus · Accepted Answer

Muscle spindles are specialized sensory receptors located within skeletal muscles that detect changes in muscle length or stretch. When a muscle is stretched, the sensory fibers within the muscle spindle are activated and send signals to the spinal cord, which in turn can lead to a contraction of the muscle.

Answer: B 
 Golgi tendon organs are located at the junction of muscles and tendons and are activated in response to tension or contraction within a muscle. When a muscle contracts, the tension within the muscle is transmitted to the Golgi tendon organs, which then send signals to the spinal cord to inhibit further contraction of the same muscle. This helps to prevent excessive force production and protect against injury.

Answer: D 
 Ib fibers are another type of sensory receptor that are located within Golgi tendon organs and are activated in response to tension within a muscle. When activated, Ib fibers send inhibitory signals to the spinal cord, which can lead to muscle relaxation.

Ia Sensory Fibers Are Activated in Response to