somatic motor - TO skeletal muscles (muscular contractions & somatic reflexes)
visceral motor - aka autonomic ns
autonomic ns - sympathetic and parasympathetic
sympathetic - accelerate the body
increase bp, heart rate, airflow, blood glucose, reduce blood flow to the skin and digestive tract (fight or
flight)
norepinephrine
parasympathetic - slow down the body
digestion and waste elimination (rest and digest)
acetylcholine ACh
properties of neurons - excitability, conductivity, secretion
excitability - stimuli
conductivity - produce electrical signals
, secretion - release chemical neurotransmitters
dendrites - short branches that receive signals from other neurons
axon - nerve fibers-- rapid conduction of electrical signals
why is there no centrioles - mitotis
structure of a neuron - axoplasma
axolemma
axon collaterals
terminal arborization
axon terminals
myelin sheath
axoplasma - cytoplasma
axolemma - plasma membrane
axon collaterals - branches of axons
terminal arborization - extensive complex of fine branches at distal end
axon terminals - swelling that form contact points (synapses) with other cell
myelin sheath - insulating layer surrounding some axons
formed by glia cells
electrical signals travel faster down myelinated axons
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