WHATS OUTSIDE THE CELL MEMBRANE ?
INTRODUCTION: If individual cells such as cheek cells are examined under the light microscope the outer boundary or cell membrane is visible. However, if that same cell is examined with an electron microscope the boundary is revealed as a double membrane. The lipids and proteins which make up this double membrane have carbohydrates attached to them that form a “coat” around the cell. The “coat” or pericellular matrix, which can be viewed under certain conditions, is involved in intracellular interactions which enable cells to bind together to form tissues. Cells which are grown in culture will produce a coat which can be seen under the light microscope. Two types of cells; fibroblasts which make up loose connective tissue, and chondrocytes which are found in cartilage, can be grown under sterile conditions in small petri dishes for 48 hours. These cells are actively producing a matrix which will exclude particles that are released on or near the cells. OBJECTIVES: To examine the cell c
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- WHATS OUTSIDE THE CELL MEMBRANE ?
