Examlex
Can the Affordable Care Act be considered a program of national health insurance?
Refractory Periods
The time period immediately following an action potential during which a neuron is unable to fire another impulse.
Phrenology
A now-discredited theory which postulated that bumps on the skull could predict mental traits and character.
Myelin Sheath
A fatty tissue layer segmentally encasing the axons of some neurons; enables vastly greater transmission speed as neural impulses hop from one node to the next.
Synaptic Gaps
The tiny spaces between neurons, across which neurotransmitters travel to transmit messages from one neuron to another.
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