Which function is not a tight junction?
A: The mechanical action of tightly integrating epithelial cells.
B: It determines the direction of material transport.
C: To limit the free diffusion of larger molecules at the top and base side of the epithelium cytoplasmic membrane.
D: It mediates cellular interactions that are regulated by calcium ions.
A: The mechanical action of tightly integrating epithelial cells.
B: It determines the direction of material transport.
C: To limit the free diffusion of larger molecules at the top and base side of the epithelium cytoplasmic membrane.
D: It mediates cellular interactions that are regulated by calcium ions.
举一反三
- The<br/>blood-testis barrier consists of:() A: Capillary endothelium B: Basement membrane C: Cconnective tissue D: Tight junction between Sertoli cells E: Spermatogenic cells
- 中国大学MOOC: In the epithelial cells of the gut Na+-linked symporters in the apical (absorptive) domain of the plasma membrane and Na+-independent transport proteins in the basolateral domain bring about the ___________________ of absorbed solutes.
- Paratfollicular cells or C cells of thyroid also secrete calcitonin, which has the function of ( ). A: Enhancing osteoblast activity B: Promoting the conversion of bone calcium into blood calcium C: Promoting calcification of bone tissue D: Reducing blood calcium E: Elevating blood calcium
- Which of the following cells constitutively express MHC class II molecules? ( ) A: macrophage B: dendritic cell C: Langerhans cell D: B cell E: thymic epithelial cell
- When cells such as white blood cells of a vertebrate engulf bacteria, the membrane transport mechanism used is ( ). A: receptor-mediated endocytosis B: active transport C: passive transport D: Phagocytosis E: exocytosis