Inferior vena cava. The inferior vena cava (or IVC) (Latin: vena, vein, cavus, hollow) is a large vein that carries deoxygenated blood from the lower and middle body into the right atrium of the heart. Its walls are rigid and has valves so the blood does not flow down via gravity.
Tight Junctions The tight junction (also referred to as a zonula occludens) is a site where the membranes of two cells come very close together. In fact, the outer leaflets of the membranes of the contacting cells appear to be fused. Tight junctions, as their name implies, act as a barrier so that materials cannot pass between two interacting cells.
IX. 3 Types Of Cell Junctions Found In Animal Tissues A. tight junctions 1. neighboring cells held tightly together via proteins 2. prevent leakage B. desmosomes (anchoring junctions) 1. function like rivets to hold cells together in strong sheets 2. common in tissues subject to stretching or mechanical stress a. skin & muscle C. gap junctions 1. are communicating junctions 2. protein lined pores 3. allow small molecules to flow between adjacent cells a. ions of heart cells to coordinate contraction b. enable embryo cells to communicate â¢ A desmosome forms a very strong spot weld between cells. It is created by the linkage of cadherins and intermediate filaments. (credit: modification of work by Mariana Ruiz Villareal)