Refer to the electromyogram (EMG). Select the correct statements. motor unit motor uniti motor unit A. EMG 1 sec force Force production is modulated by recruitment of motor units. A motor unit is composed of a few muscle fibers innervated by an upper motor neuron. According to the Henneman's size principle, the large motor units will be recruited followed by the small motor units. Small motor units have small cell body. Large motor units have many fast twitch Type I muscle fibers. Small motor units have lower threshold and 'high' excitability. Large motor units produce high tetanic tension and contraction speed.

Refer to the electromyogram (EMG). Select the correct statements. motor unit motor uniti motor unit A. EMG 1 sec force Force production is modulated by recruitment of motor units. A motor unit is composed of a few muscle fibers innervated by an upper motor neuron. According to the Henneman's size principle, the large motor units will be recruited followed by the small motor units. Small motor units have small cell body. Large motor units have many fast twitch Type I muscle fibers. Small motor units have lower threshold and 'high' excitability. Large motor units produce high tetanic tension and contraction speed.

Comprehensive Medical Terminology

4th Edition

ISBN:9781133478850

Author:Jones

Publisher:Jones

Chapter23: Mental Health

Section: Chapter Questions

Problem H4CRE

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e. M line: Photo courtesy of LUMEN (Loyola University Medical Education Network) 5. On the photograph above, label the A band, I band, z disc, and a sarcomere. I 6. The sliding filament theory is used to explain the physiology of skeletal muscle contraction. On your own, using what you have learned from this activity, write your own description of what the sliding filament theory states.
Indicate if the statements are TRUE or FALSE. Statements TRUE FALSE Hematopoiesis would most likely take place in the hyoid bone. A muscle triad consists of sarcoplasmic reticulum, a T tubule, and a terminal cisternum. Actin is found only in the striated fibers of cardiac and skeletal muscles. A sarcomere is the region of a myofibril that lies between two consecutive Z lines. Slow twitch muscle fibers are more resistant to fatigue than other muscle fiber types. Thin myofilaments are primarily composed of myosin proteins. An action potential in a muscle fiber is initiated by stimulation across the neuromuscular junction.
Fast oxidative glycolytic fibers in skeletal muscle are used Select one: O a. intermittently, for activities requiring more force output than the fast glycolytic fibers alone can produce. O b. constantly, for postural activities such as standing and sitting. O c. intermittently, for activities requiring more force output than the slow oxidative fibers alone can produce. O d. only for motions requiring maximum power output, such as jumping.
Fasciculations of lower motor neuron lesions :-a- are caused by injury currents initiated in the denervated muscle fibersb- can be recorded by electromyogramc- consist of asynchronous contraction of the muscle fibers composing a motor unitd- develop later than fibrillations of the muscle fibers
why motor neuron integrity is essential in the skeletal muscle development and function. Support your answer describing conditions associated to the motor neurons deterioration and/or malfunctioning.
Justify why motor neuron integrity is essential in the skeletal muscle development and function. Support your answer describing conditions associated to the motor neurons deterioration and/or malfunctioning.
Describe what is happening overall in the first sentence. Then describe, in detail, what is happening in each step below. Include details about what is happening at steps 5 - 7 in terms of calcium and the contraction mechanism (from a different figure). (a) -Axon terminal of somatic motor neuron Muscle fiber ACh- potential Action Na+ Action potential- -Motor end plate- lell Ca2+ released Myosin thick filament 6 + + + ++
Describe an aspect of skeletal muscle metabolism that is of interest to you, explain how it applies cell function. Add the references in APA style.
Fill in the blank: The T wave corresponds to repolarization of the muscle fibers of the _______________________.
When compared to normal muscle, the response of the denervated muscle to electrical stimulation shows :-a- decreased chronaxieb- greater response to faradic stimulationc- abnormal response to galvanic stimulationd- CCC becomes greater than ACC
A. A hypothetical genetic disease causes the body to produce antibodies that compete with acetylcholine for receptors on the motor end plate. Patients with this disease exhibit varying degrees of muscle weakness. If you could administer a drug that inhibits acetylcholinesterase or a drug that blocks acetylcholine, which one would you use to alleviate these symptoms? Briefly explain the effect that each of these two drugs would have on muscle physiology. B. Megan wants to enter a weight-lifting competition and consults you as to what type of muscle fibers she needs todevelop and how she should go about it. What types of workouts would you suggest to her? Briefly explain why.
IV. Sequence of Events: Muscle Contraction See if you can place the events that occur during muscle contraction and relaxation in their proper order. Insert numbers in the spaces 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 calciun. 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 bind with the cell wall and 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 sarcolemma. G. Calcium ions are pumped back into the sarcoplasmic reticulum. H. The myosin heads…