Why Is Blood Considered to Be a Tissue?
Scientists categorize blood as a connective tissue for two primary reasons. According to Rutgers University, blood originates in embryo in the mesoderm, one of the three primary layers of cells; blood shares this origin with other kinds of connective tissue. And, like other kinds of connective tissue, blood plays a connective role with respect to the systems within the human body.
MedlinePlus states that blood is living tissue comprising both liquid and solids. The liquid, plasma, consists of protein, salts and water, while the solids the blood contains are platelets and red and white blood cells. The majority of the blood in the human body is plasma.
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