In relaxed skeletal muscle, the H-zone of a sarcomere contains a. tropomyosin pr

Question

In relaxed skeletal muscle, the H-zone of a sarcomere contains a. tropomyosin protein b. the M-line c. myosin protein d. both a and b e. both b and c Triads are composed of a. sarcoplasmic reticulum b. tropomyosin and troponin complex c. 1 terminal cisternae and 1 T- tubules d. 2 terminal cisternae and 1 T-tubule e. sarcolemma Terminal cisternae enter the sarcolemma at which point? a. at the H-zone b. at the M-line c. at the Z-disc d. where elastic filaments attach to myosin e. at random points The function of the sarcoplasmic reticulum a. is to store calcium ions b. is to store ATP for muscle contraction c. Is to surround the actin and myosin proteins like a net d. is to store glycogen e. both a and d The function of calcium in the process of Initiating muscle contraction is to ____. a. bind to the tropomyosin protein and cause it to slide past the actin protein exposing the active site b. bind to myosin proteins causing the myosin heads to rise and attach to the active sites on the actin proteins c. bind to the tropomyosin complex causing the tropomyosin protein to slide exposing the active site on the actin protein d. stimulate the sarcoplasmic reticulum to release calcium by exocytosis e. enable muscle cells to metabolize the glycogen stored in glycosomes When skeletal muscle is at rest, the sarcoplasm of a muscle cell contains a. high numbers of mitochondria b. large amounts of calcium ions c large amounts of actin and myosin filaments d. low numbers of sarcomeres e. both a and c

Explanation / Answer

35) e) both b and c

36) d) 2 terminal cisternae and 1 t- tubule

37) d) where elastic filament attaches to myosin

38) a) to store calcium ion

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