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| Sensory (afferent) neurons |
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| Receives information from the outside and integrates it in the brain. |
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| Regulates the musculoskeletal system after a signal is received from sensory (afferent) neurons. |
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| The most ancient component that evolved in primitive fishes; composed of the cerebellum, pons, and medulla oblongata. It is an extension of the spinal cord and is primarily devoted to coordinating motor functions. |
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| Serves as a relay station for the processing of auditory and visual information. The substantial nigra produces dopamine. Parkinson's disease. |
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| Part of the fore brain that is composed of the thalamus and hypothalamus. |
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| Serves as a relay center between incoming sensory information and the cerebrum. |
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| Regulates the secretions of the pituitary gland thereby regulating the endocrine system and hormones. |
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| The most anterior portion of the brain and in humans, the largest part of the brain. Responsible for higher cognitive functions. |
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| Clusters of sensory neurons segmented invertebrates. |
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| Features of the nervous system in the Animal Kingdom |
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| (1) Composed of neurons, (2) Genes that regulate their development as well as the developmental paths of these systems are evolutionarily conserved (3) the different brain regions evolved in response to environmental challenges encountered. |
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| Take in food via the mouth; most vertebrates. |
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| Absorb food through their body wall; roundworms, tapeworms. |
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| Filter food particles out of the water; clams, sponges. |
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| Ingest materials that they reside in or on; earthworms, termites. |
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| Obtain nutrients by sucking fluids from the body of another organism; bees, mosquitoes. |
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| Structure on the tentacles of Hydras that sting and paralyze small invertebrates in order to capture them. |
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| Specialized cell within cnidocytes containing a coiled tube that shoots out a thread that entangles, pierces, or poisons its prey. |
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