Chapter 34 The Nervous System and the Senses

Chapter 34 The Nervous System and the Senses - Chapter 34...

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Chapter 34 The Nervous System and the Senses Vocabulary action potential – response from neuron, last a few milliseconds association neuron – receive signals from many sources including sensory neurons and hormones and activate motor neurons autonomic nervous system – controls involuntary movement, divides into sympathetic division and parasympathetic division that typically connect to the same organs, but produce opposite results axon – transmits the action potential blood-brain barrier – capillaries in the brain are far less permeable to prevent damaging chemicals from reaching the brain brain – divided into three sections, forebrain, midbrain, and hindbrain cell body – integrates signals; coordinates metabolic activities central nervous system – consists of a brain and spinal cord cerebellum - coordinates movements of the body cerebral cortex – region for higher thought processes, outer layer of the forebrain divided into two cerebral hemispheres cerebral hemisphere cerebrospinal fluid – under the meninges, clear liquid cushioning the brain and spinal cord and nourishes the cells of the CNS cerebrum – includes the thalamus, limbic system, and cerebral cortex (which is larger in mammals). Thalamus channels sensory signals from the body to the limbic system and cerebral cortex. The limbic system works to produce primitive emotions, drives, and behaviors. chemoreceptor cochlea – fluid filled hollow bones of the inner ear cone – type of photoreceptor, three different types one for red, green, and blue convergence – process by which many neurons transmit to a fewer number of brain cells corpus callosum – connects the two hemispheres of the brain dendrite – receives signals from other neurons or the environment divergence – process by which an output of a brain cell is carried to many neurons effector – usually muscles or glands that perform the response directed by the nervous system excitatory postsynaptic potential forebrain – also called the cerebrum gray matter – cell bodies of neurons in the center of the spinal cord that control voluntary muscles and the autonomic nervous system and communicate with the brain and other parts of the spinal cord. hair cell
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This note was uploaded on 04/06/2008 for the course BIOL 1006 taught by Professor Lipscomb during the Spring '07 term at Virginia Tech.

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Chapter 34 The Nervous System and the Senses - Chapter 34...

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