The cell in the center of the electron micrograph above is important in wound healing and plays a role in the pathological process underlying Dupuytren's contracture. Which of the following cell types is depicted? A. Endothelial cell B. Myoepithelial cell C. Myofibroblast D. Pericyte E. Smooth muscle cell
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- Can you match the sacromere anatomy with the proper answer from the list below the table graph? Sarcomere Anatomy Description/Reaction Thin Filaments ? Thick Filaments ? A Band ? I Band ? M Line ? H Zone ? Z Disc ? A) G-Actin, F-Actin, Troponin, Tropomyosin B) Myosin C) Bisected by the M Line, this area shows only the thick filaments without any thin filamentous overlap D) The point of origin for myosin filaments found in the center of the sarcomere E) An area in the center of the sarcomere marked by the entire length of the thick filaments F) A space between sarcomeres with the z-disc in the center; this region shows Actin's anchorage points and extension without myosin overlap G) Anchoring point for the thin filamentsWhich of the following characteristics does not apply to skeletal muscle tissue? a. striated b. voluntary c. multinucleated d. spindle shaped cells e. All of the above are correctIn an examination of a sample of muscle tissue, you notice that thesample consists of striated cells with multiple nuclei in each cell.This suggests that the sample is from which of the following typesof muscle?a. cardiac c. skeletalb. smooth d. Both b and c are correct.
- Which of the following statements correctly describes properties associated with the development of skeletal muscle cells? Check all that apply A. Skeletal muscle cell are multi nucleated cells B. Skeletal muscle cells have the capacity for repair due to the actions of myosatellite cells C. Skeletal muscle cells develop via the process of mitosis D. Skeletal muscle develop from a single myoblast cell asap pleaseWhen Skeletal muscle contracts an arrangement of the alternating light and dark bands traversing each skeletal muscle cell changes. Which of the following statements is not correct. (Select one answer) (a) The dark A bands will remain a constant length(b) The space occupied by the H zone will not change(c) The light I bands will shorten(d) The z lines come closer together(e) The I band consists solely of thin actin filamentsWhich of the following statements is true?a. Fast fibers have a small diameter.b. Fast fibers contain loosely packed myofibrils.c. Fast fibers have large glycogen reserves.d. Fast fibers have many mitochondria
- Why is the latent period longer during an isotonic twitch of a skeletalmuscle fiber than it is during an isometric twitch?a. Excitation–contraction coupling is slower during an isotonic twitch.b. Action potentials propagate more slowly when the fiber is shortening,so extra time is required to activate the entire fiber.c. In addition to the time for excitation-contraction coupling, it takesextra time for enough cross-bridges to attach to make the tension in themuscle fiber greater than the load.d. Fatigue sets in much more quickly during isotonic contractions, andwhen muscles are fatigued the cross-bridges move much more slowly.e. The latent period is longer because isotonic twitches only occur in slow(type I) muscle fibers.What might happen if skeletal muscle lacked tropomyosin? A. The striation pattern would disappear. B. Ca2+ levels in the muscle would decrease. C. Actin and myosin would not be able to form cross-bridges. D. Acetylcholine would not be released into the synaptic cleft. E. Myosin and actin would form cross-bridges whenever ATP is available.What does ATP binding to myosin head triggers? a. Its association with microtubules b. Its dissociation from actin microfilament c. Conformational change and rotation of myosin head d. Its association with actin microfilament
- Which cell type helps to repair injured muscle fibers?a. ganglion cellsb. myotube cellsc. myoblast cellsd. satellite cellsExplain the concept of the following in regard to muscle cells: power stroke does not need to be a super indepth answerMuscle fibers are large single cells formed by the fusion of many individual cells during development. The cytoplasm of muscle fibers contains many _________________, cylindrical bundles of two different types of filaments, ________________ and ______________________. microfilaments; actin; myosin centrosomes, tubulin; keratin fimbrin; α-actinin; formin myofibrils; actin; myosin