Chemical messengers in the human body can be produced by several different cell types, including endocrine cells, neurons, and immune cells.
Answer
True
Explanation
This statement is **true**. The material describes hormones as coming from specialized endocrine cells, neurons, and immune-system cells that produce cytokines. This emphasizes that chemical signaling is not restricted to a single cell type or organ system.\n\n**Key takeaway:** Several cell populations can release chemical messengers.\n\n**Glossary:** **Cytokine**: A signaling molecule produced by cells, including immune-system cells; **neuron**: A nerve cell.
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