What type of signaling involves secreted factors acting on nearby cells?

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Multiple Choice

What type of signaling involves secreted factors acting on nearby cells?

Explanation:
Paracrine signaling involves secreted factors acting on nearby cells. The signaling molecules are released by one cell and diffuse locally through the surrounding extracellular space to adjacent target cells, influencing their behavior without entering the bloodstream. This local action distinguishes it from endocrine signaling, where hormones travel long distances through the bloodstream to distant targets; from autocrine signaling, where the cell responds to signals it itself released; and from juxtacrine signaling, which requires direct contact between neighboring cells via membrane-bound signals. So, when secreted factors affect nearby cells, paracrine signaling is the correct concept.

Paracrine signaling involves secreted factors acting on nearby cells. The signaling molecules are released by one cell and diffuse locally through the surrounding extracellular space to adjacent target cells, influencing their behavior without entering the bloodstream. This local action distinguishes it from endocrine signaling, where hormones travel long distances through the bloodstream to distant targets; from autocrine signaling, where the cell responds to signals it itself released; and from juxtacrine signaling, which requires direct contact between neighboring cells via membrane-bound signals. So, when secreted factors affect nearby cells, paracrine signaling is the correct concept.

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