Once an action potential arrives at the neuromuscular junction, there is a sequence of events that result in muscle contraction. Place these events in the correct numerical sequence. 1 2 3 4 5 [Choose ] [Choose ] [Choose ] [Choose] [Choose ] [Choose ] acetylcholine is released the binding sites for myosin heads are exposed calcium is converted to ATP action potentials travel down t-tubules to the inner regions of muscle fibers calcium is released cross bridges form
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- The majority of consumers clean, separate, cook, and chill their food to avoid food borne illness. True FalseMuscles relaxatiom occurs when acetylcholine is cleaved from its receptors ,calcium is pulled back into the sarcoplasmic recticulum,the myosin is released from its binding site ,and the muscle fiber returns to its resting lenght true or falseIn the process of muscle contraction, which of the following steps immediately comes after the propagation of an action potential down the t-tubules of a myofiber? sliding of tropomyosin causing exposure of actin binding of myosin head to actin's active site release of calcium from the terminal cisternae binding of acetylcholine to its receptor influx of sodium at the sarcolemma
- In the process of muscle contraction, which of the following steps requires hydrolysis of ATP to complete? movement of myosin head, pulling the thin filament binding of myosin head to active site on actin resetting of the myosin head back to its ready position letting go of myosin head from the active site on actin sliding of tropomyosin causing exposure of actinIn which type of muscle fibers is ATP synthesized aerobically in mitochondria? smooth cardiac skeletal all of the above 2. In which types of muscle fibers are action potentials transmitted from one cell to the next through gap junctions? unitary smooth and cardiac cardiac and skeletal skeletal and smooth 3. All types of muscle have actin and myosin, but not all types have sarcomeres." True FalseSeconds Put the steps of excitation-contraction in order: 1 Myosin "heads" pivot, cause [ Choose ] Calcium is taken back up and the muscle relaxes Action potential triggers Ca2+ release from sarcoplasmic reticulum ACh produces large EPSP in muscle fiber 4 Muscle contracts Binding of Ca2+ to troponin causes myosin to bind to actin 5. EPSP evokes muscle action potential Alpha motor neurons release ACh Myosin "heads" pivot, cause filaments to walk along filament 7 [ Choose ) 8. [Choose ]
- Which of the following are part of the muscle contraction process?(More than one answer may be correct, please aid in answering) Question 5 options: ATP binds and detaches myosin head from actin GTP is hydrolyzed to GDP + P Acetylcholine released into neuromuscular junction by motor neurons Prolactin stimulates the reuptake of ATP. Ca2+ binds to troponin which moves tropomyosin away from actinMatch the following types of contractions: The stimulus above which no stronger contraction can be elicited, because all motor units are firing in the muscle Determined by alternating motor units of a muscle organ even when the muscle is at rest Continued sustained smooth contraction due to rapid stimulation The situation in which contractions become stronger due to stimulation before complete relaxation occurs How a smooth increase in muscle force is produced [Choose] [Choose ] [Choose] [Choose] [Choose]Which of the following would NOT occur as a result of regular exercise to a specific muscle group (assume you are resting now, but have been working this muscle group)? more capillaries will grow into the area the muscle cells will build more mitochondria O the muscle cells will build fewer contractile proteins O the muscle cells will increase their glycogen stores
- Distinguish between skeletal, smooth, and cardiac muscle in terms of location and whether they have sarcomeres. Use the sliding filament model to draw how thin filaments, thick filaments, and Z lines move during muscle contraction. Predict how perturbations of acetylcholine release, reception, or breakdown will influence muscle contraction. Predict how perturbations of actin, troponin, tropomyosin, myosin, or calcium would influence muscle contraction. Distinguish between the sympathetic and parasympathetic nervous system. Predict how changes in stress levels or situations would affect activation of the sympathetic and parasympathetic nervous system, levels of epinephrine and norepinephrine, and blood pressure.Compared to skeletal muscle, smooth muscle None of the choices are correct Has equal thick and thin filaments Uses calcium from the extracellular fluid only Has the same contractile and regulatory proteins. Has much more thick filaments than thin filamentsWhich type of contraction is associated with increased skeletal muscle fiber damage? concentric eccentric asymmetrical isometric