Question

Why are signal transduction pathways necessary?

Answer 1

It is one of the main ways different cells can communicate with each other. At the same time, they uphold their security via the semipermeable membrane that makes up the cell membrane.

For instance, in neurons, they use neurotransmitters as the molecule of communication, that usually bind to receptors on other neurons' dendrites. This signal, once interpreted, leads to change in gene expression in one way or another, among other things.

If there are deficiencies in neurotransmitters, many pathologies exist that can lead to death or other dysfunctional outcomes in the organism.