College Biology Quiz
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PHYSIOLOGY: ORGANISMAL FORM & FUNCTION
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Researchers investigating paracrine versus endocrine signaling find that pancreatic alpha cells release glucagon that affects both nearby beta cells (within 100 micrometers) and distant liver cells (via circulation). When they measure glucagon concentrations, they find 1000-fold higher levels near the alpha cells compared to circulating levels. What does this concentration difference reveal about local versus systemic cell communication?
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