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Smell There are thousands of different receptors for different kinds of molecules Smell Pheromones are not smells Pheromones are chemical signals sent from one animal to another Pheromones Pheromones either induce a behavior in another animal or cause some physiological change. washingtoneduchudlerneurokhtml TEACHER GUIDE EXPERIMENTS olfactory fatigue things that interfere with smell smell and memory and odor matching SUGGESTED TIMES 45 minutes for introducing and discussing the activities 45 minutes for the Class Experimen Beside the Olfactory Receptors there is another sensory form called Alex Saltzman and Jakob Rosenberg. Pollution. Pollution is the introduction of contaminants into a natural environment that causes instability, disorder, harm or discomfort to the . ecosystem.  i.e. physical systems or living . Sensation. Sensory Receptors detect changes in our body and surroundings. Trigger nerve impulses. Travels to CNS for interpretation. Perceive a sensation. Types of Receptors. Chemoreceptors: changes in chemical concentration of substances. Specialized neurons that respond to physical or chemical stimuli. Respond by changing ion channels, altering graded potentials. . High graded potential at receptor ending causes rapid firing of its afferent neuron.. Special Senses. :. Humans are responsive creatures. . “Irritants” are the stimuli that continually enter our nervous system for integration, and may elicit a response. . We are usually told we have five . Senses. Sensory . Receptors - detect environmental. changes and trigger nerve impulses. - . Somatic . senses (touch, pressure, temp, pain). - . Special . senses (smell, taste, vision, equilibrium. , hearing. PowerPoint® Lecture Slides prepared by Jason LaPres. Lone Star College - North Harris. Copyright © 2010 Pearson Education, Inc.. 9-1: . Sensory receptors connect our internal and external environments with the nervous system. Chemoreceptors. Receptors for taste and smell. Respond to many of the same stimuli. Chemicals in solution. Receptors for Taste and Smell Compliment each other. Vagus nerve. Page 150 of notes. #1-3. Circumvallate Papillae. Department of Physiology. College of Medicine . University of Lagos. Introduction . Smell and taste are generally classified as visceral senses because of their close association with gastrointestinal function.. Smell-. -sensed by . chemoreceptors. in the . olfactory epithelium. (found at the TOP of nasal cavity). -smell . chemoreceptors. are unique nerve cells because they are constantly replaced. -. odorants. :. This system is characterized by:. -Direct relay to cerebral cortex (not pass through the thalamus).. -Ipsilateral representation.. -Has the ability for regeneration.. (adult neurogenesis occurs also in dentate gyrus of limbic system).. There are five senses used when tasting food and drink: . sight;. smell;. taste; . hearing;. touch.. The . senses help to develop food preferences (likes and . dislikes. ) and evaluate foods through preference or discrimination tests. . ). 1. . Taste . buds – . contain the taste . receptors. A) . Most . are located within the papillae of the tongue. B) . A . few are located in soft palate, cheeks, . pharynx, . and epiglottis. C) .