An important protein in contractile muscle. OA. keratin O B. myosin O c. elastin OD. fibrin
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- After death, a person no longer makes ATP, so calcium stored in the sarcoplasmic reticulum diffuses down its concentration gradient into the muscle cytoplasm. This result is rigor mortis----an unbreakable state of muscle contraction that stiffens the body for a few days until muscles begin to decay. Explain why this contraction occurs.Explain why (a) calcium ions and (b) ACh are vital for muscle contraction.The _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filament
- The diaphragm is a ______ muscle. a. smooth b. skeletal c. dome-shaped d. a and cMuscle that has a striped appearance is described as being ________. elastic nonstriated excitable striatedWhat causes the striated appearance of skeletal muscle? O a. presence of gap junctions O b. regular arrangement of highly organized thick and thin filaments presence of the mitochondria at regular intervals O d. regular arrangement of the T tubules running transversely through the muscle fibre
- burst 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-currentMuscle Cell Anatomy O Which of the following is NOT performed by the plasmalemma? a. accommodating muscle fiber stretch b. conducting action potentials c. transporting nutrients into the muscle fiber d. storing Ca2+ ions to enable contraction O0000Muscle contractions where the muscle shortens but tension remains constant are called A. isometric B. hypermetric C. hypotonic D. isotonic E. hypertonic
- Which of these is not a major property of muscle?a. contractilityb. elasticityc. excitabilityd. extensibilitye. secretabilityThe actual contractile units of muscle, called _____, extend from middle of one _____ to middle of next along length of myofibrils. A. T tubule, M line B. sarcoplasmic reticulum, H zone C. sarcomeres, I band D. sarcolemma, A bandWhich of these increases the least as a result of muscle hypertrophy?a. number of sarcomeres d. blood vessels and mitochondriab. number of myofibrils e. connective tissuec. number of muscle fibers
