NCCAOM Herbal Board Practice Exam

Channel tropism shows which meridians an herb is believed to affect. Deng Xin Cao is listed in standard references as entering the Lung (LU), Heart (HT), and Small Intestine (SI) channels. This combination aligns with its traditional actions on heart-related issues (clearing heart heat and calming the Shen) and its influence on lung-related symptoms, with the Small Intestine channel linking to heart-related symptoms and heat in the upper/lower burners. Because it includes all three channels, it best fits the option that lists LU, HT, and SI. Other groupings omit SI or add channels not associated with this herb in classical texts.