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9 Cards in this Set

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Do most invertebrates and all animals have a nervous system? What does the nervous system do?
yes except for sponges the just have nerve cells.
Links sensory receptors and motor effectors.
neuroglia
ten time smaller and numerous
suply nutrients, remove waste, guide axon migration, and provide immune functions.
most important neuroglia in vertebraes= schwann and oligodendrocytes
Dendritic spine
increase surface area to recieve stimuli
Na+
K+
Cl+
10:1
1:30
15:1
Ligands
chemicals that attach to larger molecules to regulate or contribute to their function
What happens when an AP arrives at the end of the Axon?
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
Ach
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
Neuropeptides? Neuromodulators
polypeptides w/ neurotransmitter function.
Substance P released at synapes in CNS to pain.
eNKEPHALINS? ENDORPHINS
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