Backstage, your brain and nervous system carry out actions such as this one through a wave of communication between it's billions of nerve cells or neurons. Each neuron that makes up the communication line, itself, resembles broccoli. Incoming messages are received in the dendrites, which mirror the branching buds of the veggie. The chemical messages pass down these sprouts into the cell body and then through one main long stalk or axon of the neuron. Finally the signal heads out to connected neurons.
Neurons vary in the amount of information they receive and transmit.
Some have an extremely large social circle and receive and transmit thousands of messages. Others have only a few connections. All messages, however, are passed to connected neurons in the form of chemicals called neurotransmitters. They flow from a message-sending neuron across a gap called a synapse and onto target neurons. Many scientists compare the union to a key fitting in a lock.