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Nervous System
Nerve Cells - Micro
Question | Answer |
---|---|
What are the functions of Synapses? | allow for Enhancement or Reduction in Nerve-to-Nerve COMMUNICATION - gating passage of info |
Where are Synapses located? | FUNCTIONAL (not physical) connections between 2 Neurons |
Where are Neuromuscular Junctions located? | FUNCTIONAL connections between Motor Nerves and Muscle Cells |
What is the function of Muscular Junctions? | CONTRACTION of Skeletal Muscle |
What would be the result of damage to a Neuromuscular Junction? | Paralysis |
What are the Nerve Coverings called? | Neuroglia |
What are Neuroglia? | coiling Cell Membranes forming Myelin |
What is the function of Neuroglia? | providing electrical INSULATION between adjacent Axons |
What is the function of Schwann cells and where are they located? | improves impulse SPEED along Axon - around PERIPHERAL Nerves |
What is the function of Oligodendrocytes? | improves impulse SPEED along Axon - around CENTRAL Nerves |
What are the Nodes of Ranvier? | GAPS between Myelin Cells |
What is the significance of the Nodes of Ranvier? | only are of Axon having Na+ and K+ Channels |
What are Nerve Trunks? | Cable-like groupings of SENSORY and MOTOR fibers |
Where are Nerve Trunks located? | PERIPHERAL bundles of Nerves isolated by Connective Tissue - ie. Perineurium, Epineurium, Endoneurium |