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35 Cards in this Set
- Front
- Back
Functions of nervous system |
1. Receiving sensory input 2. Integrating information 3. Controlling muscles and glands 4. Maintaining Homeostasis 5. Establishing and maintaining mental activity |
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Consists of the brain and spinal cord |
CNS |
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Consists all thr nervous tissue outside the CNS, including nerves and ganglia. |
PNS |
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Afferent (toward) division |
Sensory division |
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Efferent (away) division |
Motor division |
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Neurons that transmit action potentials from the periphery to the cns are called |
Sensory neurons |
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Is an excellent insulator that prevents almost all ion movement across the cell membrane |
Myelin |
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Ganglion means |
Swelling or knot |
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True or false A typical small nerve, which consists of axons of multipke neurons, usually contain more unmyelinated axons than myelinated axons |
True |
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Surface of the brain is called |
Cortex |
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In the pns, a cluster of neuron cell bodies is called |
Ganglion |
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Consists of groups of neuron cell bodies and their dendrites, where there is very little myelin. |
Gray matter |
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Consists of bundles of parallel axons with their myelin sheaths, which are whitish in color. |
White matter |
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White matter forms |
Nerve tracts or conduction pathway |
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Contribute to blood brain barrier |
Astrocytes |
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Circulates cerebrospinal fluid |
Ependymal cells |
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Protects CNS from the infection |
Microglia |
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Cell processes form myelin sheaths around axons in the CNS |
Oligodendrocytes |
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Forms myelin sheaths in the PNS |
Schwann cells |
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Uneven distribution of charge means the cell membrane is |
Polarized |
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Channel that is always open |
Leak channel |
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The outside of the cell membrane is positively charged compared to the inside. |
Resting membrane potential |
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The inward movement of Na makes the inside of the membrane positive. |
Depolarization |
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Required to maintain the greater concentration of Na outside the cell membrane and K inside. |
Sodium potassiun pump |
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Causes the inside of the cell membrane to become positive |
Depolarization |
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Is a junction where the axon of one neuron interacts with another neuron or with cells of an effector organ. |
Synapse |
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The end of an axons forms |
Presynaptic synapse |
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The space separating the presynaptic and post synaptic membranes is |
Synaptic cleft |
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Ca |
Voltage gated |
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Norepinephrine |
Excitatory |
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Serotin |
Inhibition |
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Dopamine |
Excite or inhibit |
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Glycine |
Inhibitory |
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Endorphins |
Inhibitory |
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Gammaamino butyric acid |
Inhibitory |