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- Every skeletal muscle fiber is supplied by a motor neuron at the NMJ. Watch this video (http://openstaxcollege.org/l/skelmuscfiber) to learn more about what happens at the neuromuscular junction. (a) What is the definition of a motor unit? (b) What is the structural and functional difference between a large motor unit and a small motor unit? Can you give an example of each? (c) Why is the neurotransmitter acetylcholine degraded after binding to its receptor?34) what happens to skeletal muscle if there is no ATP present but plenty of calcium. Be specific relative to the sliding filament theory.burst of Calchu musc res an ldum Which of the following is true concerning the role of Calcium in the contraction of muscle- cells? 20. A. skeletal muscle cells require a burst of calcium from the sarcoplasmic reticulum. B. smooth muscle cells require a burst of calcium from the sarcoplasmic reticulum. C. cardiac muscle cells require a burst of calcium from the sarcoplasmic reticulum. D. All of the above are correct. to an ent. response to an ertraceil m-current
- 17. List the events occur at the neuromuscular junction.How does ADP facilitate kinesin "walking"?5. State the structure and function of each of the following parts of a muscle fiber. (See pg. 13 of Filled In BIOL 2401 Comp Obls.) Practice with this interactive online card activity. W Sarcolemma Sarcoplasm sarcoplasmic reticulum transverse tubules ish (United States) ● Definition Platelets that cross the cell which has a lots of acetylcholine receptors ● Platelets that cross the cell which has a lots of acetylcholine receptors 6. Identify each of the following structures when given images of skeletal muscle fibers such as the one below. an entire muscle fiber myofibril myofilaments SEP 9 Function Regulates what crosses the cells that has lots of acetylcholine receptors · (smooth ER) - stores Ca+2 ions sarcoplasmic reticulum transverse tubules . cisternae MacBook Air 0 Focus
- 3.4. About human skeletal muscle contraction, what are the correct statements? PHYSIOLOGY_basic (OJO) A muscle fiber is made by the parallel apposition of sarcomers. Generation of force relies on the formation of cross-bridges between actin and myosin filaments. In the process of contraction, adenosine triphosphate (ATP) is required both to drive the actin-myosin association-dissociation cycle and to recycle calcium back to the endoplasmic reticulum. Each muscle fiber is innervated by one neuron only. T tubules are plasma membrane invaginations of the sarcolemma that allow excitation-contraction coupling.Identify the structures within this sarcomere. A band M line Z line Myosin H zone I band Actin H |||Now in your own words, EXPLAIN (1) howa neural impulse is transferred to a muscle cell this is the process of “muscle excitation"), and (2) how the electrical impulse travels into he T-tubules and causes calcium to be released from the sarcoplasmic retículum (this is the process of “excitation-contraction coupling"): OMADidoinos reticulum 5. se mo S1e hosph erah anism
- Human Anatomy and Physiology Describe in detail the events at the neuromuscular junction and how these events allow for the excitation-contraction coupling event to occur. Be sure to also include in detail all the steps at the NMJ and the steps of the excitation-contraction coupling event.25- The sacromere is: a- A functional unit of the skeletal muscle b- The area between two intercalated discs c- A compartment in myofilament d- All the aboveThick Filaments contain OA. Actin OB. Troponin OC. Tropomyosin O D.Myosin Kinase OE. None of the above