Biology / Bio 2735 · Atom · ~20 seconds
Four Primary Animal Tissue Types
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Complex animal bodies build from four primary tissue types — epithelial, connective, muscle, and nervous — combining into organs and organ systems.
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Skin combines epithelial covering with connective, muscle, and nervous tissue underneath, all working as one organ.
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A tissue type is defined by cell function, not by which organ it appears in — the four types recur throughout the body.