ANATOMY 1 Lecture Notes - Lecture 29: East Los Angeles College, Action Potential, Chemotaxis
Document Summary
Chemokines: molecules that used to be called chemotactic molecules. Chemical magnets proximal end of severed neurons produces neurolemmocytes. Attract neurolemmocytes produce chemotactic molecules that attract proximal end of neuron. Neurons can repair unless injure the nerve cell body. Nerve does not contain nerve cell bodies. Several bundles wrapped in nerve epineurium (dense irregular ct) Dendrites and axons; the whole neuron except the nerve cell body. Nerves are specialized to create an impulse. Resting neuron is not carrying an impulse at certain time not using part of body the outside to enter the cytoplasm on the inside; negative charge on cytoplasmic side of membrane. Neuron is polarized net positive charge on outside of neuron membrane & net. Polarity is maintained because the membrane does not permit the positive ions on. Most positive ions on outside are sodium ions membrane is impermeable to. Most negative ions on the inside are chlorine ions cytoplasmic. Send impulse through resting neuron sodium ions.
