Some authors describe them as close relatives, they both produce chemical molecules that attach to receptors and affect or influence the functioning of other cells (Myers 2014).?

These authors are likely referring to the similarities between neurotransmitters and hormones. Both neurotransmitters and hormones are chemical messengers that play a crucial role in communication within the body. Neurotransmitters are released by neurons and act on nearby cells, while hormones are released by endocrine glands and travel through the bloodstream to target cells in distant parts of the body. Both neurotransmitters and hormones bind to specific receptors on target cells, triggering a response or influencing cellular activity. Despite their differences in mode of action and target cells, neurotransmitters and hormones both play important roles in regulating various physiological processes and maintaining homeostasis in the body.

Hormones and neurotransmitters