Biology 252 Muscular System Review Questions and Correct Answers
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Course
BIO 252
Institution
BIO 252
Perimysium bundles muscle fibers together into fascicles; carries the larger nerves and blood vessels as well as stretch receptors called muscle spindles; the sheath of connective tissue surrounding a bundle of muscle fibers
Endomysium surrounds each muscle fiber; layer of areolar connective tissu...
Biology 252 Muscular System Review
Questions and Correct Answers
Perimysium ✅bundles muscle fibers together into fascicles; carries the larger nerves
and blood vessels as well as stretch receptors called muscle spindles; the sheath of
connective tissue surrounding a bundle of muscle fibers
Endomysium ✅surrounds each muscle fiber; layer of areolar connective tissue that
covers each individual myocyte (muscle fiber or muscle cell); it also contains capillaries
and nerves; it overlies the muscle fiber's cell membrane - the sarcolemma
Epimysium ✅encloses the entire muscle; a sheath of fibrous elastic tissue surrounding
a muscle
Sarcolemma ✅the fine transparent tubular sheath that envelops the fibers of skeletal
muscles; the plasma membrane of a muscle fiber
T-tubules ✅tubular infoldings which penetrate the cell and emerge on the other side of
the sarcolemma; a deep invagination of the sarcolemma, which is the plasma
membrane of skeletal muscle cells; these invaginations allow depolarization of the
membrane to quickly penetrate to the interior of the cell; a tubular extension of the
plasma membrane of a muscle cell that conducts action potentials into the sarcoplasm
and excites the sarcoplasmic reticulum
Myofibril ✅basic rod-like unit of a muscle cell; composed of long proteins including
actin and myosin, and other proteins that hold them together; these proteins are
organized into thick and thin filaments called myofilaments, which repeat along the
length of the myofibril in sections called sarcomeres
Z-line ✅provides anchorage for the thin and elastic filaments; a dark narrow line that
bisects each light I band
Sarcomere ✅in skeletal and cardiac muscle, the portion of a myofibril from one Z disc
to the next, constituting one contractile unit
Actin ✅found in thin filaments; a protein that forms (together with myosin) the
contractile filaments of muscle cells
Myosin ✅found in thick filaments; a fibrous protein that forms (together with actin) the
contractile filaments of muscle cells
I-band ✅part of the sarcomere that is composed of only thin filaments (lighter bands)
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