Sensory impulses are carried to the central nervous system by

Sensory neurons

Explanation:

On the basis of direction of conduction of nerve impulse, neurons are classified as sensory neurons, motor neurons, and interneurons. Sensory neurons are the afferent neurons and serve to carry the sensory information from sense organs to the central nervous system. These neurons have sensory receptors at densities to sense the stimulus or are associated with individual sensory receptors. As the stimulus is sensed by the receptor, the sensory neuron fire the action potential which is conveyed to the central nervous system.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.