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What is the definition of paracrine secretion?
What is the definition of paracrine secretion?
- Cells secrete substances into the bloodstream that affect nearby cells by diffusion.
- Cells secrete substances into the intracellular matrix that affect nearby cells by diffusion and do not enter the bloodstream.
- Cells secrete substances into the extracellular matrix that affect nearby cells by active transport.
- Cells secrete substances into the extracellular matrix that affect nearby cells by diffusion and do not enter the bloodstream. (correct)
Which cells secrete vasodilators that act on smooth muscles to relax the vascular wall?
Which cells secrete vasodilators that act on smooth muscles to relax the vascular wall?
- Red blood cells
- White blood cells
- Endothelial cells (correct)
- Epithelial cells
How do substances secreted through paracrine secretion affect nearby cells?
How do substances secreted through paracrine secretion affect nearby cells?
- By entering the intracellular matrix
- By diffusion (correct)
- By active transport
- By entering the bloodstream
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