They range in structure from simple nerve endings to complex sense organs All receptors are transducers, changing stimulus energy into nerve energy. The effect of a stimulus on a receptor is to produce a receptor potential, or voltage change on the plasma membrane. Modality refers to the type of stimulus or sensation it produces Location is also indicated by which nerve fibers are firing. Sensory projection is the ability of the brain to identify the site of stimulation Intensity can be encoded by firing frequencies of nerve fibers, recruitment of more fibers, and stimulation of fibers that vary in their thresholds. Duration is encoded in the way nerve fibers change their firing frequencies over time Classification of Receptors Receptors can be classified by stimulus modality Chemoreceptors respond to chemicals.
Thermoreceptors respond to temperature changes.
Nociceptors are pain receptors and sense tissue damage. Mechanoreceptors respond to a physical change in their shape. Photoreceptors respond to light. Senses can be classified by whether they are general or special senses. These detect touch, pressure, heat, cold, pain, and chemistry.