3a

Wheel entries:

• action potential
• adrenal glands
• autonomic NS
• axon
• biological psych
• Central NS
• dendrite
• Endocrine
• endorphins
• hormones
• interneurons
• motor neurons
• myelin sheath
• nerves
• nervous system
• neuron
• neurotransmitters
• parasympathetic NS
• peripheral NS
• pituitary gland
• reflex
• reuptake
• sensory neurons
• somatic NS
• sympathetic NS
• synapse
• threshold