The biological process where regulatory substances, signaling molecules, or hormones that are naturally synthesized and produced within the organism are secreted into the bloodstream or local tissue environment. These endogenous factors are essential for autocrine, paracrine, and endocrine communication, driving homeostatic adjustments and adaptive responses. This term emphasizes the body’s self-regulatory capacity and intrinsic resilience.
Origin
The term is a compound of the Greek root endo- (within) and genesis (creation), combined with the clinical concept of a “factor” (a substance contributing to a result) and “release” (secretion). It is a core concept in physiology and endocrinology, contrasting with the effects of externally administered, or exogenous, substances.
Mechanism
The release is tightly controlled by feedback loops and upstream signaling, such as neural input or the presence of specific substrates. For example, exercise can trigger the endogenous release of myokines from muscle tissue, which then act on distant organs to improve insulin sensitivity. Understanding the timing and quantity of this release is vital for optimizing physiological responses through lifestyle and therapeutic interventions.
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