Question

Multiple choice questions-Tor tes scantron questios s In a sarcomere, cross-bridge formation occurs specifically in the 5. Skeletal muscle fibers are formed from embryonic cells calledwhich fuse together, making skeletal muscle cells multinucleated. 1. a. sarcomeres b. myofibrils c. myoblasts d. fascicles a. Z line. b. I band c. M line. d. H band e. zone of overlap. 6. Titin is a(n) a. elastic protein. b. thin filament protein. 2. A thin layer of connective tissue that surounds a muscle fascicle is called the a. perimysium. c. calcium-binding protein. d. e thick filament protein b. tendon. protein. c. epimysium. d. endomysium. e. aponeurosis The signal to contract is distributed deep into a muscle fiber by the 7. a. sarcolemma. b. transverse tubules (T tubules). c. sarcomere. d. myotubules. e. myofibrils. 3. What is the function of the muscle cell feature indicated by the arrows? Which of the following phrases best describes b excitation is coupled to contraction in a skeleta muscle fiber? (Excitation-Contraction Couplin 8. Through cross-bridge formation Through calcium release from the sarcoplasmic reticulum Through electrical impulses traveling the sarcolemma a. b. c. d. Through T tubules e. Through neurotransmitter release at t synaptic cleft 9. The cros-bridge cycle (contraction cycle) sta when a. b. Houses the genetic material of the cell Part of coupling the action potential to a. Ca from the SR binds to troponin. b. Саг, is actively transported into the c. Ca2+ from the SR binds to tropomyo d. ATP binds to troponin and is hydroly Making of ATP-the "power house" of the cell Storage of calcium Smallest functional unit of a muscle c. d. e. ADP Acetylcholine diffuses away from th synaptic cleft. e. 4. Z lines define the edges of which of the following? 10. At rest, active sites on the actin are blocked b b. Myofibrils c. Sarcomeres d. Myosin e. Fascicles a. calcium ions. b. troponin molecules. c. myosin molecules. d. tropomyosin molecules. e. ATP molecules

Answer 1