Final answer:
In the stretch reflex, sensory neurons transmit afferent impulses to the CNS, increase impulse frequency when muscle spindles are activated, and can transmit signals via interneurons.
Step-by-step explanation:
The characteristics of sensory neurons in the stretch reflex have several key features. These neurons do not typically transmit efferent impulses toward antagonist muscles; instead, they carry afferent impulses toward the spinal cord or central nervous system (CNS). When a muscle spindle is activated by a stretch, these sensory neurons increase their firing rate, transmitting impulses at a higher frequency. Additionally, these neurons can transmit activating impulses via interneurons as part of the reflex arc.
The correct statements about the characteristics of sensory neurons in the stretch reflex are:
- These sensory neurons transmit afferent impulses toward the spinal cord (CNS).
- When a stretch activates the muscle spindle, these sensory neurons transmit impulses at a higher frequency.
- These sensory neurons transmit activating impulses via interneurons.