MSU ANS 315 Quiz 1 Already Graded A+

MSU ANS 315 Quiz 1 Already Graded A+ 3 major components of a cell plasma membrane, cytoplasm, nucleus Which cell is an exception in regard to having the 3 major components? RBC cytoplasm -Material located between the plasma membrane and membrane surrounding the nucleus Cell Adhesion Junction desmosomes and fibrils bind cells by interaction of membrane proteins Tight Junction just below the free surface of adjacent cells around the periphery of the cell regulatory function of plasma membrane Hydrophilic and hydrophobic regions determine most permeability characteristics to water, gas, molecules Functions of membrane proteins 1. Transport of substances across membrane 2. Binding site for stuff in extracellular fluid--hormones 3. Involved in cell to cell junctions 4. May be enzymes with active binding sites 5. Identification of cells interactions of plasma membrane -environment and adjacent cell -exterior proteins are variable among cells allowing functional differences between cells protective function of plasma membrane -water impermeable barrier -prevents simple diffusion of water soluble particles and molecules -maintains homeostasis Gap Junction membrane proteins extend between adjacent cells and form a passage for exchange of small molecules and ions( smooth muscle, heart muscle) cholesterol determines shape of cell -adjusts fluidity and flexibility of membrane plasma membrane -Separates cell contents from extracellular fluid Three junctions between adjacent cells cell adhesion junction, tight junction, gap junction plasma membrane chemical components 50% lipid, 40% protein and 10% carbohydrates what are the 4 types of tissues in the body? 1. Epithelial 2. Connective 3. Muscle 4. Nervous Organization of cells in animals Cell -- tissue -- organs -- organisms