The cell bodies of neurons controlling your feet are actually located in your spine. The cell body is where they make peptides such as the one in this simulation. Their axons can be a meter long, traveling out to the tips of your toes (about 1000 times as long as the 60 um axon in the simulation. Do you think these neurons use diffusion to move peptides from the cell body to the axon tip?  Explain your reasoning

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Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.