Muscle Tissue: A collection of muscle fibers that can contract and relax to move body parts. Examples include cardiac (heart) muscle, skeletal muscle (in limbs, trunk, jaw and face) and smooth muscle (in digestive tract, eyes, blood vessels and ducts).
In humans there are normally 12 pairs of ribs. The first seven pairs are attached directly to the sternum by costal cartilages and are called true ribs.
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