Match the relaxation and contraction action of the skeletal muscle with the events mentioned. V Calcium moves out of the sarcoplasm, back into the sarcoplasmic reticulum The membrane of the muscle fiber repolarizes. The membrane of the muscle fiber depolarize. Motor neuron stops releasing its chemical signal Calcium ions are released from the sarcoplasmic reticulum into the sarcoplasm. Action potential arrives at the neuromuscular junction and synaptic vesicles release acetylcholine (ACh) 1. Relaxation 2. Contraction

Match the relaxation and contraction action of the skeletal muscle with the events mentioned. V Calcium moves out of the sarcoplasm, back into the sarcoplasmic reticulum The membrane of the muscle fiber repolarizes. The membrane of the muscle fiber depolarize. Motor neuron stops releasing its chemical signal Calcium ions are released from the sarcoplasmic reticulum into the sarcoplasm. Action potential arrives at the neuromuscular junction and synaptic vesicles release acetylcholine (ACh) 1. Relaxation 2. Contraction

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Label the molecular components of the myofilaments from a close up view of a model of a relaxed sarcomere
Muscles 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 false
Match each description to the correct phase of a muscle twitch 73. Sección Ca2+ transported back into the sarcoplasmic reticulum 74. Sarcomeres shorten 75. Depolarization occurs in the T-Tubule 76. Muscle Tension decreases A. Latent period B. Contraction phase C. Relaxation phase
In 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 False
Seconds 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 ]
Describe the Neural excitation of the muscle and Describe how a signal arriving at the axon terminal results in calcium being released from the Sarcoplasmic reticulum
Which of the following statements are true? (choose all that apply) The Z-disc is found in the middle of an l-band Myosin are known as the thick filaments The A-band is seen as "dark" under the microscope Tropomyosin is on the Actin filament During a muscle contraction, the sarcomeres move farther apart A sarcomere is located from one H-zone to the following H-zone
34) what happens to skeletal muscle if there is no ATP present but plenty of calcium. Be specific relative to the sliding filament theory.
The mechanism of contraction in smooth muscle is different from skeletal muscle in that the site of calcium binding differs ATP energizes the sliding process actin and myosin interact by the sliding filament mechanism the trigger for contraction is a rise in intracellular calcium the thick filaments have fewer myosin heads
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 filaments
After the power-stroke, the myosin heads must bind ______ in order to release actin. The muscles become very stiff (known as rigor mortis) after death because the cells run out of _____. " A calcium; calcium B troponin; troponin C tropomyosin; tropomyosin D sodium; sodium E ATP; ATP
Why does continuous calcium release within a muscle fiber cause greater tension? OActivates more calcium pumps O Activates myofibrils continuously Increases action potential frequency Lengthens sarcomere O Calcium makes the muscle fiber an offer it can't refuse