Question

growth factors mechanism of secretion
how do fibroblast growth factor (fgf) and vascular endothelial growth factor (vegf) primarily function?

• through exocrine signaling

• through paracrine signaling

• through autocrine signaling

• through endocrine signaling

Explanation:

Fibroblast growth factor (FGF) and vascular endothelial growth factor (VEGF) mainly act on nearby cells, which is characteristic of paracrine signaling (signals act on adjacent cells). Exocrine signaling involves secretion into ducts (not relevant here). Autocrine is self - signaling, and endocrine is long - distance via circulation (FGF and VEGF don't primarily use these).

Answer:

B. Through paracrine signaling