In the study of body-mind relationships, modern
science is centuries behind but rapidly gaining speed.
"Shiva and Shakti, the Hollow Cave and the Third Eye in the Brain"
by Harish Johari and Heidi Rauhut.
(Click the picture for a larger image)
The main task of nerve cells is to transfer messages as electric pulses to other nerve cells in our brain and body, using channels called dendrites and neurites. These are extremely thin, thread-like "branches" that connect every nerve cell to other nerve cells. Between them there are spaces known as synapses, which are filled with the cerebrospinal fluid in which all brain tissue is embedded. The electric pulse that is sent from one nerve cell to another does not simply flow through this fluid. The transfer of the information in the electric pulse happens with the help of molecules in the cerebrospinal fluid called neurotransmitters. These neurotransmitters absorb and pass on the information.
Neurotransmitters are also essential in the transfer of information from nerve cells to other body cells and vice versa. To read the information contained in these neurotransmitters, all body cells have "receptor molecules," attached like long antenna to the outside of their cellular bodies. Neurotransmitters, receptor molecules, and substances that affect them are today grouped as "information molecules."
Information molecules are the main body-mind link discovered by western science and the physical equivalent of Rasas.
The above texts were extracted from the book "The Yoga of the Nine Emotions", which fully explains these subjects.