Question

bio - 202 topic 1: cellular communication and endocrine system physiology
practice it
what is paracrine signaling?
when a cell releases a signal molecule that is not specific to any target cells
when a cell releases a signal molecule that travels to target cells in the same location
when a cell releases a signal molecule that only affects the cell that released it
when a cell releases a signal molecule that travels a short distance to target cells nearby
when a cell releases a signal molecule that travels a long distance to target cells far away

Explanation:

Paracrine signaling is a type of cell - to - cell communication. In paracrine signaling, the signaling molecule (such as a local mediator) is released by a cell and then travels a short distance to act on nearby target cells. This is in contrast to endocrine signaling (long - distance, traveling through the bloodstream), autocrine signaling (acting on the same cell that released the signal), and other incorrect descriptions in the options.

Answer:

When a cell releases a signal molecule that travels a short distance to target cells nearby