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.
Some of the transmembrane glycoproteins are cadherins. Adherens junctions called focal contacts can join a cell to the ECM, primarily through fibronectin receptors. Tight junctions leave no space between plasma membranes of adjacent cells to prevent the movement of molecules across cell layers.he carbohydrate groups of N-CAMs and caherins determine the strength and specificity of cell-cell recognition and adhesion. N-CAMs have repeating chains of negatively charged sialic acid which changes during development. Vesicles with N-CAMs having little sialic acid bind tighter than those with large amounts.