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Chapter -10_ Structure of Skeletal Muscle Cells questions and answers.
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Chapter -10_ Structure of Skeletal Muscle Cells questions and answers.
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Chapter #10: Structure of Skeletal MuscleCells
Arrangement of myofilaments in a muscle fiber (muscle cell) - questions and
answers--Myofilaments
*Thick (myosin)
*Thin (actin)
-Myofibril - bundles of myofilaments
*Can actively
*Anchored to inner surface of sarcolemma at either end of cell
-Sarcomeres - repeating units of myofilaments in myofibril
Gross Anatomy of Skeletal Muscles - questions and answers--Attached to bone by tendon
(origins, inseritons)
-Synergistic muscles
-Antagonistic muscles (Flexors and extensors)
-Exceptions: circular sphincter muscles
Insertion - questions and answers-attached to the bone that
Molecular anatomy of
thick (myosin) myofilaments - questions and answers--Composed of many (~100) identical
myosin molecules bundled side by side, in staggered bipolar array
*Myosin molecules have elongate tail, globular head - golf club shape
*Arrayed with half facing each end, center is just tails
*Heads form cross-bridges during
*Interactions between myosin head and actin prevented by tropomyosin during rest
Molecular anatomy of
thin (actin) myofilaments - questions and answers--Composed of multiple actin molecules
*Twisted strand composed of two rows of individual globular actin molecules
*Each actin molecule in twisted strand has active site to which a myosin head can attach
*Strands of tropomyosin cover the actin active sites during rest
*Tropomyosin strands attached to actin by
Muscle tissue - questions and answers--Skeletal - attached to bone and Striated,
-Cardiac - found in the heart and involuntary
-Smooth - lines hollow organs and Nonstriated
Organization of connective tissues in skeletal muscles - questions and answers--Endomysium -
covers individual muscle fibers
-Perimysium - sheathes bundles of muscle fibers
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