Examlex
The gas exchange system of _______ includes air sacs that communicate with the lungs with air flowing unidirectionally.
Myelin Sheath
A fatty covering that surrounds axons of some nerve cells, facilitating faster transmission of electrical impulses.
Myelin
A fatty substance that surrounds neurons' axons, helping to speed up the transmission of electrical signals in the nervous system.
Neurons
Electrically excitable cells in the nervous system that process and transmit information through electrical and chemical signals.
Neurotransmitters
Chemical messengers that transmit signals across the synaptic cleft from one neuron to another, influencing mental processes and behavior.
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