Cells communicate with each other through a variety of ways, including hormones, neurotransmitters, and paracrine signaling. Hormones are secreted by endocrine cells and travel through the bloodstream to target cells, while neurotransmitters are released by neurons and travel through the synapse to target neurons. Meanwhile, paracrine signaling involves the release of small molecules to nearby cells, which signals the cells to perform specific functions. Cell permeability is important in all of these forms of communication, as it allows the molecules to enter and leave the cell.
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