Examlex
Provide a brief explanation of the relationship between amino acid sequences in proteins and nucleotide sequences in DNA and what they can reveal about evolutionary relationships.
Myelin Sheaths
Protective coverings around nerve fibers that increase the speed at which electrical impulses propagate along the nerve cells.
White Matter
Brain tissue composed of myelinated nerve fibers that connect different areas of the brain, facilitating communication among neurons.
Synapses
Structures that permit a neuron (nerve cell) to pass an electrical or chemical signal to another neuron, essential for the transmission of nerve impulses.
Neurotransmitter
A chemical secreted by a neuron sending a message that carries the impulse across the synaptic gap to the receiving cell.
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