Answer
a. Tight junctions:region of adjacent cells are noun together by fusion of the otter phospholipid layer of pl. memb.
i. like a zipper.. difficult/impossible for substances to pass between cells
ii. prevent digestive juices from seeping between epithelial cells and digesting the connective tissue (go thru not between)
b. Gap junctions: ringlike connexon --> six transmembrane proteins arranged, somewhat like the segments of an orange. small particles can pass from cytoplasm of one cell to the next thru pores.
i. like snaps
Work Step by Step
Page 160 Cell Junctions
