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Questions and Answers
What is the definition of paracrine secretion?
What is the definition of paracrine secretion?
- Cells secrete substances into the extracellular matrix that affect nearby cells by diffusion and do not enter the bloodstream. (correct)
- 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 bloodstream that affect nearby cells by diffusion.
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
- Epithelial cells
- White blood cells
- Endothelial cells (correct)
How do substances secreted through paracrine secretion affect nearby cells?
How do substances secreted through paracrine secretion affect nearby cells?
- By diffusion (correct)
- By active transport
- By entering the intracellular matrix
- By entering the bloodstream
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