the basal structure of the digestive tract can be divided into four layers, from inner to outer: mucous layer submucous layer, muscular layer and outer membrane.
消化管的基本结构由内向外可分为四层,即粘膜层、粘膜下层、肌肉层和外膜。
thee stomach has a relatively large epithelial surface, but because it has a thick mucous layer and the time that the drug remains there is usually relatively short, absorption is limited.
胃具有相对大的上皮表面,但由于它有较厚的粘液层,而且药物在胃内停留的时间相对较短,吸收也较少。
the stomach has a relatively large epithelial surface, but because it has a thick mucous layer and the time that the drug remains there is usually relatively short, absorption is limited.
胃具有相对大的上皮表面,但由于它有较厚的粘液层,而且药物在胃内停留的时间相对较短,吸收也较少。
when the researchers dissected these now susceptible mice, they discovered that the mucous layer that typically lines the gut was only half as thick as in protected mice.