Which of the following definitions/properties most correctly describes muscle fibers? These make up muscle fibers Actin & myosin ATP in generated here Includes a sarcomere, Z discs, H zone, and A band Regulates the calcium ion concentration (contractions)
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Step 1: Muscle fibers are made up of sarcomeres, which are the basic contractile units of muscle. Show more…
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In a muscle fiber, a. the sarcolemma is connective tissue holding the myofibrils together. b. the sarcoplasmic reticulum stores calcium. c. both myosin and actin filaments have cross-bridges. d. there is a T system but no endoplasmic reticulum. e. All of these are correct.
Adi S.
The advantage of having many nuclei in a skeletal muscle fiber is A) the ability to contract. B) the ability to produce more ATP with little oxygen. C) the ability to repair the fiber after an injury. D) the ability to produce large amounts of the enzymes and structural proteins needed for contraction. E) none of the above 7) The skeletal muscles store calcium ions in the A) sarcolemma. B) sarcomere. C) sarcosome. D) sarcoplasmic reticulum. E) sarcoplasm. 8) The area between Z lines is the A) sarcolemma. B) sarcomere. C) sarcoplasmic reticulum. D) myofibril. E) myofilament. 9) The center of the sarcomere is the A) Z line. B) M line. C) H band. D) A band. E) I band. 10) The terminal cisternae are parts of the A) myofilaments. B) sarcoplasmic reticula. C) myofibrils. D) I bands. E) sarcolemma. 11) The tropomyosin molecules are attached to A) actin molecules. B) myosin molecules. C) troponin molecules. D) ATP molecules. E) calcium ions.
Madhur L.
Which of the following statements is true? a. A muscle fiber is a collection of cells embedded in connective tissue. b. A sarcomere contains both actin and myosin molecules arranged in a parallel fashion. c. The function of Ca2+ in contraction is to bind to tropomysin. d. Myofibrils are individual muscle cells. e. The I band of a sarcomere is the region where thin and thick filaments overlap.
Sulav P.
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