A sarcomere shortens when______ . a. thick filaments shorten b. thin filaments shorten c. both thick and thin filaments shorten d. none of the above
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A sarcomere shortens when______ .
a. thick filaments shorten
b. thin filaments shorten
c. both thick and thin filaments shorten
d. none of the above
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- Dark areas called _____ made of proteins are where actin filaments attach within a myofibril. A. Z lines B. A bands C.T tubules D. I bandsC Sliding filament model D. Sliding microtubule model filaments. They must form and dissociate repeatedly during contraction. are links between the Filamentous F-actin of thin filaments and myosin heads of thick А. Cross bridges B. Calcium switches C. Contraction cycles ! D. Power strokes 52-Calcium plays a key role during contraction of skeletal muscles. When calcium concentration is low in the intracellular compartment, myosin-binding sites on actin are blocked by intracellularly, Calcium binds to When calcium levels rise causing A. Tropomyosin, Troponin C, Tropomyosin to shift and allowing myosin to bind. B. Tropomyosin, Troponin T, Troponin C C. Troponin I, Troponin C, Troponin T D. Troponin C, Troponin T, F-actin 53-During the contraction of sarcomere, while A. A band gets bigger, H zone becomes smaller. B. Sarcomere does not change in size, H zone gets bigger C. H zone double in size, Z lines become closer D. A band does not change in size, Sarcomere becomes smaller nokanalne g…The______ is the basic unit of contraction. a. osteoblast c. myofibril b. sarcomere d. myosin filament
- According to the sliding filament model, binding sites on actin open when ________. a. creatine phosphate levels rise b. ATP levels rise c. acetylcholine levels rise d. calcium ion levels riseThin and thick filaments are organized into functionalunits called ________.a. myofibrilsb. myofilamentsc. T-tubulesd. sarcomeresUnlike skeletal muscle cells, cardiac muscle cells________." A do not use the sliding filament mechanism of contraction B are not striated C do not rely on an influx of Ca+2 for contraction to occur D do not require neural stimulation to contract
- Muscle relaxation occurs when ________. a. calcium ions are actively transported out of the sarcoplasmic reticulum b. calcium ions diffuse out of the sarcoplasmic reticulum c. calcium ions are actively transported into the sarcoplasmic reticulum d. calcium ions diffuse into the sarcoplasmic reticulumAt low intracellular Ca2+ concentration, _________________ the active sites on the thin actin filament. a. troponin blocks b. troponin exposes c. tropomyosin blocks d. tropomyosin exposes e. a and cThe correct order for the smallest to the largest unit oforganization in muscle tissue is ________.a. fascicle, filament, muscle fiber, myofibrilb. filament, myofibril, muscle fiber, fasciclec. muscle fiber, fascicle, filament, myofibrild. myofibril, muscle fiber, filament, fascicle
- The Sarcomere 2 Thin filaments are often named for which protein? a. actin b. myosin c. troponin d. tropomyosinburst of Calchu musc res an ldum Which of the following is true concerning the role of Calcium in the contraction of muscle- cells? 20. A. skeletal muscle cells require a burst of calcium from the sarcoplasmic reticulum. B. smooth muscle cells require a burst of calcium from the sarcoplasmic reticulum. C. cardiac muscle cells require a burst of calcium from the sarcoplasmic reticulum. D. All of the above are correct. to an ent. response to an ertraceil m-currentA thick filament is made up of Select one: a. myosin and regulatory filaments b. actin and regulatory proteins C. actin and myosin d. myosin