diffuse neuroendocrine cell less, pyramidal EM: dense-core g.-small granule cell neuroepithelial body: cell+ NF Function: secret hormones to regulate contract of SM and secretion of gland . 5-hydroxytryptamine(serotonin) calcitonin ⅲi. enkephalin clear basement membrane
diffuse neuroendocrine cell: -less, pyramidal -EM: dense-core g.-small granule cell neuroepithelial body: cell + NF -Function: secret hormones to regulate contract of SM and secretion of gland i. 5-hydroxytryptamine(serotonin) ii. calcitonin iii. enkephalin * clear basement membrane
2)Submucosa LCT with BV, LV and n ● tracheal gland:mxed ● diffuse LT and ln SIg a= secretory component (secreted by epi cell)+ lg a produced by plasma cell)
2) Submucosa: LCT, with BV, LV and N tracheal gland: mixed diffuse LT and LN * S Ig A = secretory component (secreted by epi. cell) + Ig A ( produced by plasma cell)
N ac k 3)Adventitia ● cartilage ring:16-20C” shaped e circular ligament: elastic F SM- posterior part( membrane part SM, elastic f, tracheal gland
3) Adventitia: cartilage ring: 16-20 “C ” shaped circular ligament: elastic F SM- posterior part( membrane part): SM, elastic F, tracheal gland
肺静脉 卜支气 a. 3. Lung 呼吸性细 支气管 paired organ,燃 肺泡管 located In thoracic cavity sexi 一肺泡囊 ∴一肺泡 终末網攴气管密∴∴ 钟泡囊 肺动脉
3. Lung ---paired organ, located in thoracic cavity