Receptor cells are specialized cells that detect and respond to various stimuli in the environment. They play a critical role in sensory perception and are integral to physiological processes. Understanding their structure and function is essential for comprehending how organisms interact with their surroundings. Receptor cells can be classified into different types based on their structure and the stimuli they respond to. Common structures include cilia or microvilli that increase surface area and enhance detection efficiency. The membranes of these cells contain specific receptor proteins that bind to corresponding stimuli, initiating signal transduction.