Laboratory Manual for Human Anatomy & Physiology Main Version
4th Edition
ISBN: 9781260159110
Author: Terry Martin
Publisher: Mcgraw-hill Higher Education (us)
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Textbook Question
Chapter 21, Problem 1.2.4A
What is meant by the term motor unit recruitment?
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Why is Excitation Contraction Coupling important?
List the 3 major classes of motor proteins:
Describe how each of the following factors influences motor unit recruitment:
a) Increasing contraction speed
b) Increasing force output
c) Increasing fatigue
Chapter 21 Solutions
Laboratory Manual for Human Anatomy & Physiology Main Version
Ch. 21 - What factors in addition to gender contribute to...Ch. 21 - Prob. 1.2.3ACh. 21 - What is meant by the term motor unit recruitment?Ch. 21 - Prob. 1.2.5ACh. 21 - Complete the following: Compare the strength of...Ch. 21 - Complete the following: Is there a difference in...Ch. 21 - Complete the following: Define muscle fatigue, and...Ch. 21 - Complete the following: Define dynamometry.
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- Define motor unit and describe its structure?arrow_forwardIn your own words briefly describe the role of dystrophin within the motor unit.arrow_forwardWhat does the term motor unit recruitment mean? Are you right-handed, left-handed, or ambidextrous? Which hand took the longest time to fatigue? Explainarrow_forward
- What is a motor neuron pool?arrow_forwardf) In relation to the size principle of motor unit recruitment, the mechanism of recruitment order is directly related to the: a) Size (cross-sectional area) of muscle fibres. b) Size (diameter) of the motor axons. c) Size of the motoneuron soma and dendrites. d) All of the above.arrow_forwardHello, may I please get help with this physiology question? An explanation leading to the correct answer would be helpful! Scenario: Your friend Arnold S, who sometimes goes by "Dutch", has started lifting weights because he wants his muscles to get bigger. He's done a little bit of research, and he tells you that weight lifting is increasing the size of myofibrils. Arnie is getting huge, and so you are hesitant to correct him, but you know that what he's saying isn't quite right. The more likely explanation for Arnold's muscles getting bigger is...arrow_forward
- Muscle motor unit recruitment follows the pattern of the SO (I) fibers being recruited first followed by the FOG (IIa) and then ultimately by the FG (IIb) if and when workloads require this. Muscle fatigue follows the order that the FG fibers fatigue first, followed by the FOG fibers and finally (maybe never) the SO fibers. Explain how it makes sense physiologically that the last fibers to be recruited to contract are the first to fatigue, while the first fibers to be recruited to contract would be the last to fatigue.arrow_forwardThe subtractive technique that uses nerve stimulation at two points and subtracting the difference between the two recorded latencies (time from stimulation to muscle contraction) gives a more accurate estimate of motor conduction velocity than stimulating the nerve at one point and measuring the time it takes for the muscle to contract. Which of the following statements best describes the reason why the subtractive techniques is more accurate? The subtractive technique is more accurate because it takes into account the delay caused by the electrical resistance of the recording electrodes, which adds to the recorded delay. The subtractive technique is more accurate because it takes into account the delay caused by synaptic transmission from the axon terminals to the muscle fibres. The subtractive technique is more accurate because it takes into account the slower conduction speed of the small unmyelinated axon endings that slow down nerve conduction…arrow_forwardWhat differences would you expect to see between amotor unit where muscular strength is more important thanfine control and another motor unit where fine control ismore important?arrow_forward
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