Anatomy & Physiology
5th Edition
ISBN: 9780321861580
Author: Marieb, Elaine N.
Publisher: Pearson College Div
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Textbook Question
Chapter 9, Problem 21RQ
Define and draw a motor unit.
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Detail the structure and function of a motor unit.
Define motor unit and describe its structure?
2. We discussed how muscle spindles allow for precision of movement as a muscle lengthens, and
particular muscles which require more precise movements will contain more spindles.
In addition to this precision control over muscle length, there are other differences between
muscles which enable more precision in how much force is generated. Consider the two graphs
below which depict force generated by two different muscles as additional motor units are
recruited.
Force
Muscle A
Load
Force
Muscle B
Load
a) Describe why the first steps for a low force contraction in both muscles are smaller than the
later ones in the context of motor units and force production.
Chapter 9 Solutions
Anatomy & Physiology
Ch. 9 - When describing muscle, what does striated mean?Ch. 9 - Prob. 2CYUCh. 9 - How does the term epimysium relate to the role and...Ch. 9 - Which myofilaments have binding sites for calcium?...Ch. 9 - Which region or organelle-cytosol, mitochondrion,...Ch. 9 - What are the three structural components of a...Ch. 9 - What is the final trigger for contraction? What is...Ch. 9 - What prevents the filaments from sliding back to...Ch. 9 - What would happen if a muscle fiber suddenly ran...Ch. 9 - What is a motor unit?
Ch. 9 - What is happening in the muscle during the latent...Ch. 9 - Prob. 12CYUCh. 9 - When Eric returned from jogging, he was breathing...Ch. 9 - List two factors that influence contractile force...Ch. 9 - Prob. 15CYUCh. 9 - How do aerobic and resistance exercise differ in...Ch. 9 - Compare the structures of skeletal and smooth...Ch. 9 - Calcium is the trigger for contraction of all...Ch. 9 - How does the stress-relaxation response suit the...Ch. 9 - The connective tissue covering that encloses the...Ch. 9 - Prob. 2RQCh. 9 - Prob. 3RQCh. 9 - Prob. 4RQCh. 9 - Prob. 5RQCh. 9 - Contraction elicited by a single brief stimulus is...Ch. 9 - A smooth, sustained contraction resulting from...Ch. 9 - Characteristics of isometric contractions include...Ch. 9 - During muscle contraction, ATP is provided by (a)...Ch. 9 - The neurotransmitter released by somatic motor...Ch. 9 - The ions that enter the skeletal muscle cell...Ch. 9 - Myoglobin has a special function in muscle tissue....Ch. 9 - 13. Aerobic exercise results in all of the...Ch. 9 - The smooth muscle type found in the walls of...Ch. 9 - Name and describe the four special functional...Ch. 9 - Distinguish between (a) direct and indirect muscle...Ch. 9 - (a) Describe the structure of a sarcomere and...Ch. 9 - What is the importance of acetylcholinesterase in...Ch. 9 - Explain how a slight (but smooth) contraction...Ch. 9 - Explain what is meant by the term...Ch. 9 - Define and draw a motor unit.Ch. 9 - Describe the three distinct types of skeletal...Ch. 9 - True or false: Most muscles contain a predominance...Ch. 9 - Describe some cause(s) of muscle fatigue and...Ch. 9 - Define EPOC.Ch. 9 - Smooth muscle has some unique properties, such as...Ch. 9 - Lets continue our tale of Mrs. DeStephanos medical...Ch. 9 - Lets continue our tale of Mrs. DeStephanos medical...Ch. 9 - Lets continue our tale of Mrs. DeStephanos medical...Ch. 9 - Lets continue our tale of Mrs. DeStephanos medical...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- True/false Large motor unit is involved with fine-motor movement (precision)arrow_forwardIf the muscle fiber is stretched to 150% of muscle length and thentechnically stimulated, what would be the total force measured?arrow_forwardIdentify the nature and physiological significance of the series-elastic component of muscle contraction.arrow_forward
- Isometric exercise is best described as applying a force O a) with movement through a full and complete range of motion O b) while a muscle is lengthening and returning to a resting position c) without any change in length of the muscle O d) at a constant speedarrow_forwardWhat is the duration of the mechanical eventarrow_forwardDiscuss the All or None Law of Muscle contraction.arrow_forward
- Distinguish between concentric, isometric and eccentric contractions, the physiology of the contraction, and what function it serves. Give examples of tasks that involve each type.arrow_forwardList five proteins of the myofilaments and describe theirphysical arrangement.arrow_forwardA motor unit is the smallest voluntary functional unit of force production and consists of one motor neuron and all the muscle fibers that it innervates. a.) True b.) Falsearrow_forward
- Describe the protein structures involved in muscle contraction. Illustratearrow_forwardWhen utilizing microprocessor technology for testing muscle strength, you are typically looking at what form of muscle contraction? Concentric Isokinetic Isometric Eccentricarrow_forwardDiscuss the specific role of ATP in muscle contraction.arrow_forward
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