This term denotes the intricate network of biochemical signaling molecules—including hormones, neurotransmitters, and cytokines—that transmit information throughout the human body to coordinate physiological function. These systems act as the body’s internal communication infrastructure, regulating everything from mood and cognition to metabolism and immune response. The clarity and precision of this chemical signaling are fundamental to maintaining homeostasis and overall health. Disruptions in these systems are often the root cause of complex, chronic health issues.
Origin
The conceptual origin lies in the foundation of modern endocrinology and neurobiology, which recognized the role of secreted substances in distant cellular communication. The term “system” reflects the understanding, formalized in the mid-20th century, that these messengers do not act in isolation but within interconnected, highly regulated pathways. It is a unifying term that acknowledges the crosstalk between the endocrine, nervous, and immune systems.
Mechanism
The mechanism involves the synthesis of a signaling molecule by a source cell, its transport through the circulation or synaptic cleft, and its eventual binding to a specific receptor on a target cell. This binding event initiates a cascade of intracellular events, known as signal transduction, which ultimately alters the target cell’s function, gene expression, or rate of secretion. The system relies on rapid synthesis, controlled release, and timely degradation of these chemical messengers to ensure accurate and dynamic physiological responses.
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