Question

Golgi tendon organs:

a)are silenced when a muscle is stretched

b)inhibit the discharge of muscle spindles

c)produce inhibition of the motor neurons of their own muscle when they are activated

d)behave as receptors in parallel with contracting muscle fibres

Answer 1

Option C is correct.

Muscle spindle and golgi tendon organs are two different types of receptors.

–Golgi tendon organ is a proprioreceptor that lies within the tendon of the muscle.

–muscke spindle is a stretch receptor within the muscle.

A)Golgi tendon organs are the receptors that are activated by strech or active contraction of muscle.

B) activaton of these receptors results in a reflex inhibition of the muscle through inverse myotactic reflex. It does NOT result in inhibition of muscle spindle.

C) stimulation of golgi tendon organ results in transmission of impulse through spinal cord by afferent neurons. In the spinal cord afferent neuron synapses with inhibitory association neuron . Inhibitiory association neuron in turn synapses with excitatory moror neuron that innervates the muscle attached to the tendon. The inhibitiory impulses lead to relaxation of contracted muscle.

D) behave as receptors in SERIES with the contracing muscle fibers.

Muscle spindle are located in parallel to the muscle fibres.