Question : 11.All cross bridges within a sarcomere stroke in unison when : 1417091

11.All cross bridges within a sarcomere stroke in unison when pulling the actin filaments.

12.Foot proteins link the actin molecules together within a thin filament.

13.The functional unit of skeletal muscle is the myofibril.

14.According to the sliding filament mechanism of muscle contraction, the thick filaments slide in closer together to shorten the sarcomere.

15.The T tubule is lined with the muscle cell's membrane.

16.According to the sliding filament mechanism of muscle contraction, the muscle fibers of one motor unit slide in closer together between the muscle fibers of adjacent motor units.

17.The thick filaments within a myofibril have ATPase activity.

18.Cross bridges have actin binding sites that are normally covered by troponin and tropomyosin except during excitation-contraction coupling.

19.During muscle contraction, the A band becomes shorter.

20.Muscle relaxation does not take place until all of the ATP is used up.