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Marsupials are mammals that give birth to premature young and carry them in pouches; examples include kangaroos,wallabies,and opossums.Most marsupials live in Australia,but one species,the Virginia opossum,occurs in North and South America.How do you think a marsupial came to be in North and South America when all others are on the opposite side of Earth?
Unmyelinated
refers to nerve fibers that lack a myelin sheath, resulting in slower signal transmission compared to myelinated fibers.
Axon Diameter
Refers to the width of an axon, which influences the speed of nerve impulse conduction, with larger diameters allowing faster conduction.
Neurotransmitters
Chemicals that transmit signals across a synapse from one neuron to another in the nervous system.
Retrograde Signals
Molecular signals that travel from the postsynaptic neuron back to the presynaptic neuron, modulating neurotransmission.
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