Vocabulary CH.4 Flashcards
Contact points between the plasma membranes of tissue cells.
Cell Junctions
Consist of weblike strands of transmembrane proteins that fuse together the outer surfaces of adjacent plasma membranes to seal off passageways between adjacent cells.
(inhibit the passage of substances between cells)
Tight Junctions
A double-walled sac containing the heart and the roots of the great vessels. It fixes the heart to the mediastinum, gives protection against infection, and provides the lubrication for the heart.
Pericardium
The central compartment of the thoracic cavity surrounded by loose connective tissue, as an undelineated region that contains a group of structures within the thorax.
Mediastinum
This central compartment of the thoracic cavity contains the heart and its vessels, the esophagus, trachea, phrenic and cardiac nerves, the thoracic duct, thymus and lymph nodes of the central chest.
Mediastinum
The serous membrane of the pericardial cavity covering the heart and lining the mediastinum.
Pericardium
The serous membrane lining the thoracic cavity and surrounding the lungs.
Pleura
The serious membrane lining the abdominopelvic cavity and the viscera
Peritoneum
Contain plaque (a dense layer of proteins on the inside of the plasma membrane that attaches both to membrane proteins and to microfilaments of the cytoskeleton.) and join cells together with cadherins.
Adherens Junctions
Transmembrane glycoproteins that join cells together in adherens junctions and desmosomes.
Cadherins
Contain plaque (a dense layer of proteins on the inside of the plasma membrane that attaches both to membrane proteins and to intermediate filaments of the cytoskeleton) and have transmembrane glycoproteins that extend into the intercellular space between adjacent cell membranes and attach cells to one another.
Desmosomes
Do not link adjacent cells together, but anchor cells to the basement membrane.
Hemidesmosomes
Transmembrane glycoproteins in hemidesmosomes that attach to intermediate filaments on the inside of the plasma membrane and attach to the protein laminin (which is present in the basement membrane) on the outside of the plasma membrane
Integrins
The plasma membranes of these junctions are not fused together but are separated by a very narrow intracellular gap. Connexons connect neighboring cells in these junctions.
Gap Junctions
Tiny fluid-filled tunnels formed by the membrane proteins called connexins. They allow small molecules to diffuse from the cytosol of one cell to another but prevent the passage of large molecules.
Connexons
