Circulatory System

Organ systems--Several organs are found in an organ system. Some organ systems are: the nervous, sensory, endocrine, skeletal, muscular, circulatory, immune, digestive, respiratory, excretory, and reproductive systems. Epithelial Tissue . Classified according to cell shape. Squamous (frog skin), cuboidal (kidney tubule cells) and columnar (gut ... ................
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