我一周前的便秘就是感覺腸子不給力，蠕動很差。當年看到ymck 的帖子，感覺有趣，做了一點研究和筆記。對我而言，這種解釋更容易實驗驗證。下麵就是當年的記錄：
Y：人參含有中樞擬膽堿活性和擬兒茶酚胺活性，增加膽堿係統功能，提高膽堿受體密度。http://www.360daoyi.cn/info/view.asp?id=427
直腸蠕動同時受交感神經和副交感神經控製，這兩種神經係統的遞質都是膽堿。所以人參可以促進指腸蠕動，利於排便。老年人腸道蠕動減弱，是個好方法。
中樞擬膽堿活性= cholinergic drugs or parasympathomimetic drug, sometimes called a cholinomimetic drug, is a substance that stimulates the parasympathetic nervous system (PSNS).[1] These chemicals are also called cholinergic drugs because acetylcholine (ACh) is the neurotransmitter used by the PSNS. Chemicals in this family can act either directly by stimulating the nicotinic or muscarinic receptors (thus mimicking acetylcholine), or indirectly by inhibiting cholinesterase, promoting acetylcholine release, or other mechanisms.
擬兒茶酚胺活性 = Catecholamine activity，類似或促進去甲腎上腺素、腎上腺素、多巴胺（DA）功能。
人參似乎會抑製腎上腺髓質分泌兒茶酚胺（腎上腺素，去甲腎上腺素，多巴胺）。
Y：人參含有中樞擬膽堿活性和擬兒茶酚胺活性，增加膽堿係統功能，提高膽堿受體密度。可能對阿氏癡呆有效，增加乙酰膽堿功能。
