Substance X is secreted by one cell, travels a short distance through interstitial fluid, and produces an effect in a cell immediately adjacent to the original secreting cell. All of the following terms could describe this substance except
A)nitric oxide.
B)neurotransmitter.
C)prostaglandin.
D)pheromone.
E)growth factor.

Question

Quizplus · Accepted Answer

Pheromones are chemicals that are released into the environment and affect the behavior or physiology of other individuals of the same species. They are not limited to acting on adjacent cells, as is the case with Substance X. Nitric oxide, neurotransmitters, prostaglandins, and growth factors are all examples of signaling molecules that can act over short distances and could potentially fit the description of Substance X.

Substance X Is Secreted by One Cell, Travels a Short