Messages are passed through many billions of spaces among neurons called

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Messages in the brain are transmitted through synapses, which are the tiny spaces between neurons where the electrical impulse is transmitted via chemical messengers called neurotransmitters. Nodes and glial cells do play important roles in the nervous system but are not directly involved in transmitting messages between neurons. Hormones are chemical messengers that are typically secreted by glands and travel through the blood to their targets, and are not directly involved in the transmission of messages between neurons.

Messages Are Passed Through Many Billions of Spaces Among Neurons