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- The release of calcium ions initiates muscle contractions. Watch this video (http://openstaxcollege.org/l/calciumrole) to learn more about the role of calcium. (a) What are “T-tubules� and what is their role? (b) Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.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?After death, a person no longer makes ATP, so calcium stored in the sarcoplasmic reticulum diffuses down its concentration gradient into the muscle cytoplasm. This result is rigor mortis----an unbreakable state of muscle contraction that stiffens the body for a few days until muscles begin to decay. Explain why this contraction occurs.
- Cheetahs and human sprinters tend to have a high proportion of ________fibers in their leg muscles. a. white b. fast red c. slow redConsidering the Length-Tension Relationship of skeletal muscle fibers, over stretching a muscle fiber or not stretching a muscle fiber enough, results ina decrease in force developed (during contraction) because: 27. A. An "over-stretched" muscle fiber or an “under-stretched" muscle fiber will not allow Calcium, from the sarcoplasmic reticulum, to adequately diffuse into the cytoplasm. B. An "over-stretched" muscle fiber or an "under-stretched" muscle fiber will not allow an optimum amount of contact and overlap for the contractile proteins. C. An "over-stretched" muscle fiber or an“under-stretched" muscle fiber will not allow the Action Potential to reach the troponin-activation channels. D. An "over-stretched" muscle fiber or an "under-stretched" muscle fiber will not allow the Sodium current to depolarize the membrane. Teurons to5. 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
- Discuss the following statement: “The basal lam-ina of muscle fibers serves as a molecular bulletin board,in which adjoining cells can post messages that direct thedifferentiation and function of the underlying cells.”Match the relaxation and contraction action of the skeletal muscle with the events mentioned. D D D D 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 from the sarcoplasmic reticulum into the sarcoplasm. ions are released Action potential arrives at the neuromuscular junction and synaptic vesicles release acetylcholine (ACh) 1. Relaxation 2. ContractionZAV : ۱۲:۵۲م سبت ۳ نیسان docs.google.com a The functions of tropomyosin in skeletal muscle include sliding on actin to produce shortening releasing Ca2+ after initiation of contraction. binding to myosin during contraction. acting as a "relaxing protein" at rest by covering up the siteswhere myosin binds to actin generating ATP, which it passes to the contractilemechanism. Which of the following is the proper progression of the levels of organization in the body? chemicals, cells, organs, tissues, body systems, whole body chemicals, cells, tissues, organs, body systems, whole body cells, chemicals, tissues, organs, whole body, body systems cells, chemicals, organs, tissues, whole body, body systems O chemicals, cells, tissues, body systems, organs, whole body working as barriers that restricts the movement of protein and other molecules from the underlying connective tissue into the epithelium Basement membrane Epithelial tissue Dermis Microvilli Back Next Never submit passwords…
- 34) what happens to skeletal muscle if there is no ATP present but plenty of calcium. Be specific relative to the sliding filament theory.Give an account of the excitation-contraction coupling (Figure 3) in skeletal muscle fibers. Highlight the role of dihydropyridine receptors and ryanodine receptors and the fate of A detailed description of the cross bridge cycle is not calcium ions after contraction. necessary. -Axon teminal of (=) somatic motor neuron ACh Muscle fiber potential Pion ++ Action potential- Na Motor end plate- T-tubule Sarcoptasmic reticulum lellll Ca2+ DHP receptor Tropomyosin Troponin z disk Actin M line Myosin head Myosin thick filamentDescribe the following regions/structures of a sarcomere. (Fig 12.5) A band - striated patterns of light and dark muscle fibers; scatters light unevenly; uses the entire length of thick filaments; the center of the band uses only thick filaments H zone I band M line Z disc