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Reflect back on the Muscle Fatigue investigation we did earlier in this Activity. Choose one of your classmate’s interpretation to one of these questions:
- What happened to your energy & ability to pinch the clothespin as you progressed through each trial? Why?
- What might cause one to be able to get more squeezes, in other words, to have less fatigue? Explain in terms of biological concepts.
- Suggest how the amount of ATP produced cause your muscle cells to be less efficient. When did this change in the amount of ATP produced occur in this investigation? How could you tell?
- Your muscles would probably recover enough after 10 minutes to operate at the original efficiency. Explain why.
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- What are the two types of muscle movement categories? Give an example for both. E. Describe Swammerdam's experiment and Galvani's experiment with frog legs. What did they tell us about muscl contraction? 3. What is the sliding-filament model for muscle contraction? Describe the role of actin and myosin of sarcomeres in the model (be specific). 4. Describe how an action potential triggers muscle contraction. Know the specific molecules involved. 5. Describe the structural and functional differences between smooth, cardiac and skeletal muscles. What are the three types of skeletal muscle fibers and how do they differ in structure and function? Next « Previous MacBook ProVhat are the two types of muscle movement categories? Give an example for both. Describe Swammerdam's experiment and Galvani's experiment with frog legs. What did they tell us about muscle contraction? What is the sliding-filament model for muscle contraction? Describe the role of actin and myosin of sarcomeres in the model (be specific). Describe how an action potential triggers muscle contraction. Know the specific molecules involved. . Describe the structural and functional differences between smooth, cardiac and skeletal muscles. What are the three types of skeletal muscle fibers and how do they differ in structure and function? Next « Previous MacBook ProMULTIPLE ANSWER QUESTIONS. Select all that apply. Which of the following occurs when the muscle is excited (contracting)? The myosin binding site on the actin thin filaments are covered Ca2+ ion are being released from the sarcoplasmic reticulum into the sarcoplasm Zone of overlap of a sprcomere increases The H-zone of a sarcomere gets larger O The myosin head is NOT attached to the actin thin filament - Previous Next
- First, explain how resting membrane potential is established in terms of ion concentration and electric charge. Next, explain the process of neural signal transmission from an alpha motor neuron to the muscle fiber. Do this by explaining how an AP is generated (ions and membrane proteins) at the neuron, how the signal is propagated, what happens at the axon terminal, what happens at the motor endplate, and explain all the molecular events that occur to cause muscle contraction.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.Human Anatomy & Physiology I (BIO168) Sequence of Events for Muscle Contraction Practice Worksheet See if you can place the events that occur during muscle contraction and relaxation in their proper order. Insert numbers in the paces provided to order the events in the proper sequence. _____ A. An electrical impulse travels over the sarcolemma and inward along the T-tubules, causing sacs in the sarcoplasmic reticulum to release calcium. ____ B. The release of ACh stops and acetylcholinesterase breaks down any remaining ACh. _____ C. Troponin and tropomyosin prevent the myosin heads from grasping the thin filament, and the muscle fiber relaxes. _____ D. An electrical impulse causes small vesicles at the end of a motor neuron to release the neurotransmitter acetylcholine (ACh). _____ E. Calcium binds with the troponin on the actin filament, exposing attachment points. _____ F. ACh diffuses across the synaptic cleft, where it stimulates receptors in the…
- 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 useMuscle Contraction In an experiment, the strength of a neural stimulus and the resulting muscle contraction are compared. A single motor neuron that synapses with one muscle fibre is observed in this experiment. One end of the muscle fibre is attached to a mass. The following data were obtained from the experiment. Analyze the data and answer the following questions. Number of Trials Strength of Stimulus (mV) Mass Lifted by Muscle Contraction (g) 1 20 2 40 3 60 50 4 80 50 100 Not Tested 120 50 *note that the voltage applied is positive in order to raise potential from resting to threshold Identify the manipulated, responding and controlled variables in the experiment described above. Strength of Stimulus Number of Muscle Fibre Stimulated Mass Lifted by Muscle Contraction* The figure below is called the It shows the amount of tension generated by a muscle and the force of contraction depends on how stretched or contracted it was before it was stimulated. * 100 80 (d) 60 (e) Normal /range 40 (a) 20 1.2 μm 1.6 μm 2.1 μm 2.2 um 2.6μm 3.6 μη Decreased length Increased length Optimal resting length Tension (percent of maximum)
- 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.respectively. Speculate about what this ratio difference means in terms of muscle activity potential and a possible evolutionary significance of this difference. 4. Fleas can jump up to 40 times their body length. However, calculation on the biomechanics of the leg extensor muscles, do not provide enough force to account for such jumps. If the flea's ability to jump high is not reliant upon muscle strength, how else could the leg structure be modified to assist in the flea jumping mechanism? How would you test your idea? Search.entries or author Unread Edit View Insert Format Tools Table 12pt v Paragraph v B I A 1) 2$ & 4 6 dele E T Y U H J K L Dz * 00Can you modify this experiment so that the mass lifted by the muscle contraction continues to increase for every trial? If yes, explain how it should be modified. If no, explain why.