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Anatomy & Physiology I Nervous System 1. Outline the major Divisions of the Nervous system by filling out the chart on the last page of this lab:. 2. Define briefly: a) tracts - b) nerves 3. What are neuroglia cells? List and briefly describe the 4 in the CNS & describe them. a) __________________________- b) __________________________- c) __________________________- d) __________________________- 4. List and briefly describe the neuroglia cells found in the PNS. a) __________________________- b) __________________________- 5. What is myelin sheath and where is it located? 6. Define briefly these parts of a neuron. Label these parts on the following diagram. a) cytoplasmb) axon hillockc) initial segmentd) nucleus of schwann celle) node of Ranvierf) synaptic end bulbg) dendrites- 7. Fill in the blanks (parts of a neuron continued): The transfer of information between neurons is called a ___________________. Most synapses occur between the __________________ ______________________ of one neuron and the ________________________ of another. The fluid-filled space approximately 1 millionth of an inch wide between 2 neurons is called ______________ ________________. Neurotransmitters are present in ___________________ __________________ and act to open or close ________ ________________ that influence membrane permeability. 8. a. What are neurotransmitters? b. Give 3 examples of neurotransmitters. c. Where are neurotransmittors active (where do they work related to the neuron)? 9. How do neurotransmitters get “recycled”? Why is this important? 10. What enzymes are involved in neurotransmitter recycling? Autonomic Nervous System FOCUS: Comparison of the Sympathetic and Parasympathetic Nervous Systems ANATOMICAL differences Sympathetic Parasympathetic Origin Length of motor neurons Location of ganglion Neurotransmitter released FUNCTIONAL differences Structure Pupils Heart Blood vessels Bronchioles Intestinal sphincters GI motility/secretions Urinary bladder Urethral sphincter Adrenal medulla Liver Sweat glands Salivary glands Lacrimal glands Sympathetic Parasympathetic Label the major Divisions of the Nervous System