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9 Cards in this Set
- Front
- Back
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Do most invertebrates and all animals have a nervous system? What does the nervous system do?
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yes except for sponges the just have nerve cells.
Links sensory receptors and motor effectors. |
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neuroglia
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ten time smaller and numerous
suply nutrients, remove waste, guide axon migration, and provide immune functions. most important neuroglia in vertebraes= schwann and oligodendrocytes |
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Dendritic spine
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increase surface area to recieve stimuli
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Na+
K+ Cl+ |
10:1
1:30 15:1 |
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Ligands
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chemicals that attach to larger molecules to regulate or contribute to their function
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What happens when an AP arrives at the end of the Axon?
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voltage gated Ca++ ion channesl are opened which stimulate the fusion of synaptic vesicles filled w/ neurotransmitters w/ plasma membrane and rlease by exocytosis. where they rapidly diffuse and bind to ligand gated receptor proteins of postsynaptic cell,
High frequency more vesicles release there contents |
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Ach
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crosses synapse b/t motor neron and muscle fiber (neuromuscular junctions)
Bind to Na and K ligand gated channels on postsynaptic to Produce EPSP and if large enough can open Na and K voltage gated ion channels |
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Neuropeptides? Neuromodulators
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polypeptides w/ neurotransmitter function.
Substance P released at synapes in CNS to pain. |
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eNKEPHALINS? ENDORPHINS
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Neuropeptides control pain perception.
Released by axons from the brain in spinal cord block pain being sent back to the brain. Relesed in brain stem block perception of pain |
