Physiology: cellular membrane & intercellular junctions Flashcards
describe the properties of the cellular membrane (4)
fluid, phospholipid bilayer, semipermeable, trilaminar appearance
what does amphipathic mean
it is hydrophobic(tail) and hydrophilic(head)
what model does the cellular membrane follow
fluid-mosaic model
what is the function of the cellular membrane
act as a barrier to water-soluble molecules and allows small uncharged polar molecules to pass
what different kinds of membrane components are there
integral(intrinsic) or peripheral(extrinsic)
what is another name(s) for tight junctions
occluding junctions/zonula occludens
describe the function of tight junctions
links adjacent cells
prevents diffusion
what is another name(s) for adhering junctions
zonula adherens/anchoring junctions
describe the function of adhering junctions
provide mechanical strength
give an example of adhering junctions
desmosomes in heart/skin
what is another name of gap junctions
communicating junctions
describe the function of gap junctions
allows movement of molecules between cells
give an example of where gap junctions are used
cells in heart, for electrical conduction
