Anatomy & Physiology (6th Edition)
6th Edition
ISBN: 9780134156415
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Textbook Question
Chapter 9, Problem 19SAQ
Explain how a slight (but smooth) contraction differs from a vigorous contraction of the same muscle. Use the concepts of multiple motor unit summation.
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Explain how a slight (but smooth) contraction differs from a vigorous contraction of the same muscle. Use the concepts of multiple motor unit summation.
Explain how optimal skeletal muscle force (high muscle tension) can be achieved during a high intensity exercise. (Mention and explain how wave summation, motor recruitment summation, muscle length, and type of muscle fibers activated can affect muscle force).
Match the following types of contractions:
The stimulus above which no
stronger contraction can be
elicited, because all motor
units are firing in the muscle
Determined by alternating
motor units of a muscle organ
even when the muscle is at
rest
Continued sustained smooth
contraction due to rapid
stimulation
The situation in which
contractions become stronger
due to stimulation before
complete relaxation occurs
How a smooth increase in
muscle force is produced
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Chapter 9 Solutions
Anatomy & Physiology (6th Edition)
Ch. 9.1 - When describing muscle, what does striated mean?Ch. 9.1 - Prob. 2CYUCh. 9.2 - How does the term epimysium relate to the role and...Ch. 9.3 - Which myofilaments have binding sites for calcium?...Ch. 9.3 - Which region or organelle-cytosol, mitochondrion,...Ch. 9.3 - MAKING CONNECTIONS Consider a phosphorus atom that...Ch. 9.4 - What are the three structural components of a...Ch. 9.4 - What is the final trigger for contraction? What is...Ch. 9.4 - What prevents the filaments from sliding back to...Ch. 9.4 - What would happen if a muscle fiber suddenly ran...
Ch. 9.5 - What is a motor unit?Ch. 9.5 - What is happening in the muscle during the latent...Ch. 9.5 - Prob. 13CYUCh. 9.6 - When Eric returned from jogging, he was breathing...Ch. 9.7 - List two factors that influence contractile force...Ch. 9.7 - Prob. 16CYUCh. 9.8 - How do aerobic and resistance exercise differ in...Ch. 9.9 - Compare the structures of skeletal and smooth...Ch. 9.9 - Calcium is the trigger for contraction of all...Ch. 9.9 - How does the stress-relaxation response suit the...Ch. 9.9 - MAKING CONNECTIONS Intracellular calcium performs...Ch. 9 - The connective tissue covering that encloses the...Ch. 9 - Prob. 2MCCh. 9 - Prob. 3MCCh. 9 - Prob. 4MCCh. 9 - Prob. 5MCCh. 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 - Prob. 13MCCh. 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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- What is a motor unit? Why does a rapid series of muscle twitches yield a stronger overall contraction than a single twitch?arrow_forwardDistinguish 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_forwardDescribe in details the biochemical and mechanochemical series of events that enables motor neurons to trigger muscle contraction, using the biceps brachii as an example.arrow_forward
- Explain the meaning of a sarcomere and its parts. Compare the contracted and relaxed sarcomere by writing the mechanisms that lead to contraction and relaxation. Describe the Sliding Filament Model of Muscle Contraction. Discuss the All or None Law of Muscle contraction.arrow_forwardDistinguish between skeletal, smooth, and cardiac muscle in terms of location and whether they have sarcomeres. Use the sliding filament model to draw how thin filaments, thick filaments, and Z lines move during muscle contraction. Predict how perturbations of acetylcholine release, reception, or breakdown will influence muscle contraction. Predict how perturbations of actin, troponin, tropomyosin, myosin, or calcium would influence muscle contraction. Distinguish between the sympathetic and parasympathetic nervous system. Predict how changes in stress levels or situations would affect activation of the sympathetic and parasympathetic nervous system, levels of epinephrine and norepinephrine, and blood pressure.arrow_forwardList and describe all of the major events that occur during a muscle contraction starting with the arrival of a motor command at a neuromuscular junction and ending with the shortening of the sarcomere.arrow_forward
- Define a motor unit. Of what physiological advantage is a small motor unit arrangement in skeletal muscle? Explain why a latent period is observed between the application of a stimulus and contraction of the stimulated muscle.arrow_forwardExplain how muscle velocity changes with varying muscle force (tension) during the different types of contractions. You may use a graph, and provide an example for each type of contraction (mention three types of muscle contraction, and how muscle velocity is related to muscle force with each type of contraction)arrow_forward2. 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.arrow_forward
- Describe how each of the following factors influences motor unit recruitment: a) Increasing contraction speed b) Increasing force output c) Increasing fatiguearrow_forwardExplain how skeletal muscle stimulation produces a sustained contraction.arrow_forwardExplain what the zone of overlap is, and how it contributes to muscle contraction (hint: include cross-bridge formation). Then describe how this impacts muscle tension at different lengths: optimal overlap, shortened (decreased length) and stretch (increased length)arrow_forward
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