Eyes work when light from the environment is

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Unformatted text preview: we are far from understanding what it is about “brain” that creates “mind” — nor how much “mind” can in turn affect the physical brain. • Many people have an “active eye” model of sight, in which light or some type of “vision rays” shoot out from the eye and return with an image of what is seen. Eyes work when light from the environment is reflected off of an object and enters our eyes. • Students often believe that humans can “see in the dark.” Even if one is put in a room that has absolutely no night, young students are sometimes convinced that it will just take longer to “get used” to the darkness. Notes Biology 103 Dr. Karen Bledsoe http://www.wou.edu/~bledsoek/ Eyes only see when there is light in the environment. “Getting used” to “dark” as we often experience it is in reality the eye adjusting to very low levels of light. Few of us have experienced absolute darkness. • Young students may also have an “active ear” model of hearing, believing that hearing is the result of active listening or paying attention. Ears receive auditory signals all the time. Whether we perceive these depends on our attentiveness. Reading notes: • Draw and label the parts of a neuron, and note the function of the parts. • Define “action potential” and state how it works. • Define “synapse” and explain what happens at the synapse. • Read “Druds, Diseases, and Neurotransmitters” and summarize the connection between neurotransmitters and addictive drugs. • Distinguish between convergence and divergence of neural signals. • Explain how a reflex arc works. • Distinguish between: central and peripheral nervous systems; brain and spinal cord; motor and sensory neurons; somatic and autonomic nervous systems; sympathetic and parasympathetic divisions. • State the main functions of these br...
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This document was uploaded on 02/25/2014 for the course BIOLOGY 103 at Western Oregon University.

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