Final answer:
Sensory stimuli are transmitted to the spinal cord by afferent axons, which enter through the dorsal root and carry information from sensory receptors to the central nervous system. the correct option is b)Sensory receptors .
Step-by-step explanation:
Sensory stimuli enter the spinal cord via afferent axons:
Sensory information from the body is received by sensory receptors and transmitted to the central nervous system (CNS) through sensory neurons. The first step in conveying sensory information to the CNS is via sensory nerve fibers, specifically afferent axons. These nerve fibers are part of the sensory neurons located in dorsal root ganglia.
The dorsal root is exclusively composed of these afferent axons, which distinguish it from the ventral root that contains axons of motor neurons controlling muscles and glands. Once inside the spinal cord, the sensory information can either be relayed to higher brain centers via ascending pathways, such as the dorsal column or spinothalamic tract, or it can result in reflex actions through synaptic connections with interneurons and motor neurons within the spinal cord's gray matter.