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Collagen is the connective tissue.
The cells are often bound to the extracellular matrix by proteins in the plasma membrane. The extracellular matrix is the structural support of tissue.
The matrix of blood is called plasma
its cells can be separated from each other by an extracellular matrix.
Another name for Calcium salts in bone is hydroxyapatite. The extracellular mix in blood called plasma is the matrix.
What defines a connective tissue is living cells surrounded by a non-living extracellular matrix. The red and white blood cells are the living cells and the plasma they float in is the non-living extracellular matrix therefore blood is classified as a connective tissue.
The space between cells can be called the extracellular space, the extracellular material, or the extracellular matrix. This space is not a vacuum; it is filled with material. If the material is gel-like it is called the ground substance, which is filled with many dissolved solute particles, and the tissue will be loose. If the material in the extracellular space has some fibers of protein in it, the entire tissue will have a stronger consistency.
Typically when the word "matrix" is used in cytological or histological context it referes to the extracellular matrix, which is the area in a tissue not occupied by cells, or the area between cells.
Connective tissues have an extracellular matrix that gives them their characteristic properties. Blood is a liquid connective tissue that has a fluid matrix.
Blood is a liquid connective tissue composed of cells and an extracellular matrix. The matrix being the plasma and the cells being erythrocytes (red blood cells), platelets, and 5 types of leukocyte (white blood cells).
The Extracellular Matrix
Richard O. Hynes has written: 'Extracellular matrix biology' -- subject(s): Cell Communication, Extracellular matrix, Cell interaction, Physiology, Extracellular Matrix 'Fibronectins' -- subject(s): Fibronectins