Chapter 45 Sensory Systems 2011

Chapter 45 Sensory Systems 2011 - Chapter 45 Sensory...

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Unformatted text preview: Chapter 45 Sensory Systems earning Objectives: . Perceiving of environmental information . Types of Receptors . Mechanoreceptors . Hearing and Vision . Olfaction hapter 45 Sensory Systems eneral Principles of Sensory Perception 1. Animals must perceive the external environment in order to gain energy and to avoid predation. The senses that animals commonly use to do this are: vision, hearing, taste, touch, equilibrium, and pain. Some organisms also use special senses like the ability to perceive: magnetic fields (birds), barometric pressure (birds), and electric fields (diverse types of fishes). 3. The four steps in perceiving information from the environment are: . Transduction- converting external stimulus to an electrical signal. . Amplifying the signal . Transmission of the signal to the brain. . Integration of the signal in the brain. 4. External stimuli are perceived either by special sensory cells or by dendrites of the neurons themselves (eg. Olfaction). 5. No matter what the external stimulus is, the transduction of the signal always results in an action potential being generated. Differences in the strength of the external stimulus are perceived by the number of action potentials per second rather than the strength of the action potential itself. 6. There are numerous types of sensory receptors that are arranged in classes: . Thermoreceptors- detect changes in temperature . Mechanoreceptors- detect distortions in membranes caused by touch or pressure . Chemoreceptors- respond to specific chemicals...
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Chapter 45 Sensory Systems 2011 - Chapter 45 Sensory...

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