Question

the secretion of a signal molecule by a cell into the local environment, followed by a response by a number of cells in the immediate vicinity, is an example of ...
ohormonal signaling.
osynaptic signaling.
oendocrine signaling.
oparacrine signaling.
oextracellular matrix signaling.

Explanation:

Paracrine signaling involves a cell secreting a signal molecule into the local environment that affects nearby cells. Hormonal and endocrine signaling involve signals traveling long - distance via the bloodstream. Synaptic signaling occurs at synapses between neurons. Extracellular matrix signaling is related to the matrix's influence on cells, not this type of local cell - to - cell signaling.

Answer:

paracrine signaling.