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- How does the activation of vertebrate skeletal muscle differ from the activation of arthropod muscle fibers?
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- Skeletal muscle is described as striated. What are the lighter, thinner stripes noted under the microscope? Group of answer choices troponin actin myosin dystrophin Rather than innervating individual muscle fibers, motor neurons often innervate two or more muscle fibers. The motor neuron and the muscle fibers it innervates are together called a: Group of answer choices motor unit myofibril muscle fascicle motor fascia Fast glycolytic muscle fibers allow for relatively quick ATP energy production by splitting glucose (but eventually leads to fatigue), a process described as: Group of answer choices fermentation aerobic pathway anaerobic pathway ATP reserve useWhich of the following alters the force of skeletal muscle contraction? the frequency of stimulation does NOT alter the force of skeletal muscle contraction alters the force of skeletal muscle contraction the size of the fibers being stimulated does NOT alter the force of skeletal muscle contraction alters the force of skeletal muscle contraction the number of muscle fibers stimulated does NOT alter the force of skeletal muscle contraction alters the force of skeletal muscle contraction the length- tension relationship of the muscle does NOT alter the force of skeletal muscle contraction alters the force of skeletal muscle contractionPlease answer all of this following questions in your own words, thank you. Q1: Which muscles form the quadriceps? How do they function together? Q2: studied the steps of skeletal muscle contraction (sliding filament mechanism). Briefly outline the steps of the sliding filament model of muscle contraction. just mention what is happening with each of the "filaments." Q3: What would be the effect on the muscle if acetylcholinesterase was not present? (8)
- We move a lot and do not even realize how intricate these movements may be from gross motor to fine motor manipulations. Briefly explain the steps involved in a single muscle contraction beginning at the neuromuscular junction through one complete contraction and relaxation for the sliding filament theory. Don’t forget to include all the major proteins (actin, myosin, troponin and tropomyosin) involved as well as calcium and ATP.Which of the following step(s) about the excitation of skeletal muscle is/are incorrect? 1. Acetylcholine is released and binds to motor end plate receptors 2. An action potential is created and moves down T-tubules 3. Calcium is released from the sarcoplasmic reticulum 4. Calcium ions bind to tropomyosin to shift troponin off the binding sites for cross-bridging 5. Myosin forms cross-bridges and binds with actin to pull it towards middle of sarcomereRead over the following article from the New York Times. It describes a study in which researchers look at the role of the central nervous system in developing muscle strength. Complete the following: 1. Briefly summarize the article Provide information about the study as to what they were looking at and any results or findings. 2. Briefly discuss some of the concepts from the adaptations to Resistance Training and how they may relate to what the journal discussed.
- The following is an oscilloscope tracing displaying the muscle twitch of an intact, viable frog skeletal muscle. The muscle was stimulated via electrodes placed on the muscle at time zero. Which of the following most closely estimates the length of the latent period of this muscle twitch? Force EV D 20 5 msec 115 msec 140 msec 25 msec 60 BD Time (msec) 100 120Using pyramidal motor tract as a template, describe the voluntary control of skeletal muscles being sure to use appropriate course terminology. Start from the very first neuron and end with neural innervation onto muscle fiber.From the following choices, choose the THREE, that would result in prevention of muscle contraction (in other words, which three descriptive changes below would result in flaccid paralysis of a muscle). exocytosis of acetylcholine is constant, even without action potential injection of botulinum toxin calcium cannot be pumped back into the terminal cisternae acetylcholine receptor remains open to sodium active sites on actin a permanently exposed dramatically increase the activity of acetylcholinesterase calcium cannot bind troponin
- In what ways does the neural control of smooth muscle activity differ from that of skeletal muscle? Describe how a stimulus may lead to the contraction of a smooth muscle cell without a change in the plasma membrane potential. Describe the differences between single-unit and multiunit smooth muscles. cite your referencesYou can choose one or more than one option About human skeletal muscle contraction, what are the correct statements? PHYSIOLOGY basi:. 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 tubules are plasma membrane imaginations of the sarcolemma that allow excitation-contraction coupling Arginase is an enzyme that : BIOCHEMISTRY advanced is expressed in the cytoplasm of hepatocytes shows two isoenzymes in mammals. found in the liver and other tissues catalyzes the formation of urea and ornithine from arginine. induces hyperammonemia when it is overexpressed is inhibited by basic amino acids such as lysine and ornithine.…What does the depolarization of the transverse tubules (T-tubules) promote? Group of answer choices entry of sodium ions into the muscle fiber through voltage-gated sodium ion channels release of calcium from the sarcoplasmic reticulum release of acetylcholine from vesicles in the motor neuron into the synaptic cleft binding of acetylcholine to ligand-gated sodium ion channels