(CNN) — Poets, novelists and songwriters have described it in countless turns of phrase, but at the level of biology, love is all about chemicals.

Although the physiology of romantic love has not been extensively studied, scientists can trace the symptoms of deep attraction to their logical sources.

“Part of the whole attraction process is strongly linked to physiological arousal as a whole,” said Timothy Loving (his real name), assistant professor of human ecology at the University of Texas, Austin. “Typically, that’s going to start with things like increased heart rate, sweatiness and so on.” Continued here