Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Nervous Sys1
Term | Definition |
---|---|
Central Nervous System | Brain and Spinal Cord |
Peripheral Nervous Systems | Nerve tissues that lie in the "outer regions" of the nervous system - extend to the extremities |
Cranial Nerves | originate in the brain |
Spinal Nerves | originate in the spinal cord |
Afferent Division | sensory pathways - towards the brain |
Efferent Division | motor pathways - away from the brain |
Somatic Nervous System | carry information to the skeletal muscles. Voluntary |
Autonomic Nervous System | carry information to the smooth and cardiac muscles, and glands. Involuntary |
Sympathetic NS | "fight or flight" |
Parasympathetic NS | return to resting activities "rest and repair" |
Glial Cells | DO NOT conduct impulses but support the functions of neurons |
Neurons | excitable cells that conduct nerve implulses |
Astrocytes | type of glial cells that help form the Blood Brain Barrier |
Microglia | type of glial cells that are used for phagocytosis |
Oligodendrocytes | helps produce fatty myelin sheath around nerve fibers in the CNS |
Schwann Cells | helps produce fatty myelin sheath around nerve fibers in the PNS |
Node of Ranvier | microscopic gaps between Schwann Cells |
Multipolar Neuron | One Axon, several dendrites, mostly found in the CNS |
Bipolar Neuron | Least common type of neuron, found in retina, inner ear, and olfactory pathway (nasal). |
Reflex Arc | A signal conduction route |
Potential Energy | The difference in ion concentration across the plasma membrane |
Resting Potential | -70mV |
Depolarization | Na+ causes the movement of the membrane potential to zero |
Repolarization | K+ causes the movement back to -70mV |
Action Potential | AKA- Nerve Impulse |
Refractory Period | after the threshold potential is surpassed and the axon will not respond stimuli |
Relative Refractory Period | after the absolute refractory period, can only be stimulated if the stimulus is really strong |
Saltatory Conduction | Action Potential seems to "Leap" from node to node |
Anesthetics | Block pain, inhibit the opening of the Na+ channels |
Marcaine | Anesthetic- used in dental procedures |
Procaine | Anesthetic- used to block signals in sensory pathways of the spinal cord |
Benzocaine | Found in over the counter products that release pain with teething, sore throats, and other ailments |
Neurotransmitters | How neurons talk to one another |
Created by:
PRO Teacher
terry.reyna