Blood is a connective tissue because it links different body systems. What is the liquid matrix in which blood cells are suspended?
Plasma
Blood is a fluid connective tissue: its cells (red cells, white cells and platelets) float in a liquid matrix.
That liquid matrix is plasma, a straw-coloured fluid made mostly of water with proteins, salts, nutrients and hormones dissolved in it.
Platelets are cell fragments, haemoglobin is a pigment inside red cells, and cytoplasm is the material inside a cell.
Hence, the answer is plasma.
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