A ligand secreted from a cell to a nearby cell that signals developmental differentiation is called
A)juxtacrine factor.
B)paracrine factor.
C)endocrine factor.
D)autocrine factor.

Question

Quizplus · Accepted Answer

A paracrine factor is a type of signaling molecule that is secreted by a cell, travels a short distance, and is received by nearby cells to stimulate developmental differentiation. Juxtacrine factors, on the other hand, require direct cell-to-cell contact, while endocrine factors travel through the bloodstream to distant target cells. Autocrine factors signal to the same cell that produced them. Therefore, the best choice is B, paracrine factor.

A Ligand Secreted from a Cell to a Nearby Cell