Skeletal muscle fibers tend to be shorter than smooth muscle fibers. skeletal muscle lacks the coarse connective tissue sheaths that are found in smooth muscle. skeletal muscle fibers contain sarcomeres; smooth muscle fibers do not. smooth muscle lacks the thin and thick filaments characteristic of skeletal muscle.

Skeletal muscle fibers contain sarcomeres; smooth muscle fibers do not.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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