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What is the definition of paracrine secretion?

  • Cells secrete substances into the extracellular matrix that affect distant cells by active transport
  • Cells secrete substances into the extracellular matrix that affect nearby cells by diffusion (correct)
  • Cells secrete substances into the bloodstream that affect nearby cells by diffusion
  • Cells secrete substances into the bloodstream that affect distant cells by active transport
  • Which cells secrete vasodilators that act on smooth muscles to relax vascular walls?

  • Adipocytes
  • Fibroblasts
  • Epithelial cells
  • Endothelial cells (correct)
  • What is the main difference between paracrine and endocrine secretion?

  • Paracrine secretion affects distant cells, while endocrine secretion affects nearby cells
  • Paracrine secretion involves active transport, while endocrine secretion involves diffusion
  • Paracrine secretion involves diffusion, while endocrine secretion involves active transport
  • Paracrine secretion affects nearby cells, while endocrine secretion affects distant cells (correct)
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