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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 distant cells by active transport
- Cells secrete substances into the bloodstream that affect nearby cells by diffusion
- Cells secrete substances into the extracellular matrix that affect nearby cells by diffusion (correct)
- Cells secrete substances into the extracellular matrix that affect distant cells by active transport
Which cells secrete vasodilators that act on smooth muscles to relax vascular walls?
Which cells secrete vasodilators that act on smooth muscles to relax vascular walls?
- Fibroblasts
- Endothelial cells (correct)
- Adipocytes
- Epithelial cells
What is the main difference between paracrine and endocrine secretion?
What is the main difference between paracrine and endocrine secretion?
- Paracrine secretion affects distant cells, while endocrine secretion affects nearby cells
- Paracrine secretion involves diffusion, while endocrine secretion involves active transport
- Paracrine secretion involves active transport, while endocrine secretion involves diffusion
- Paracrine secretion affects nearby cells, while endocrine secretion affects distant cells (correct)
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