Human Anatomy (8th Edition) - Standalone book
8th Edition
ISBN: 9780321883322
Author: Frederic H. Martini, Robert B. Tallitsch
Publisher: PEARSON
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Textbook Question
Chapter 9, Problem 6RC
A motor unit from a skeletal muscle contains 1500 muscle fibers. Would this muscle be involved in fine, delicate movements or powerful, gross movements? Explain.
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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.
A skeletal muscle can often maintain a moderate level of active tension for long periods of time, even though many of its fibers become fatigued Explain.
Characteristics of smooth muscles fibers
are:
spindle shaped, unbranched, unstriated,
uninucleate and involuntary
spindle shaped, unbranched, multistriated,
uninucleate and involuntary
cylinderical, unbranched, unstriated,
uninucleate and involuntary
Cylindrical, unbranched, striated,
multinucleate and involuntary
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Chapter 9 Solutions
Human Anatomy (8th Edition) - Standalone book
Ch. 9 - 1. Active sites on actin become available for...Ch. 9 - Prob. 3RFTCh. 9 - Prob. 4RFTCh. 9 - 4. Another name for a muscle that is a prime mover...Ch. 9 - Prob. 1RFTCh. 9 - Prob. 6RFTCh. 9 - 7. The theory that explains muscle contraction is...Ch. 9 - Prob. 8RFTCh. 9 - Label the illustrations to the right as...Ch. 9 - Prob. 1RC
Ch. 9 - 2. The ability to recover from injuries in older...Ch. 9 - Prob. 3RCCh. 9 - Prob. 4RCCh. 9 - Prob. 5RCCh. 9 - A motor unit from a skeletal muscle contains 1500...Ch. 9 - 7. What is the role of the zone of overlap in...Ch. 9 - Several anatomy students take up weight lifting...Ch. 9 - Prob. 2CT
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- What is the function of the sarcoplasmic reticulum in muscle cell contraction?arrow_forwardWhat is a motor unit? Why does a rapid series of muscle twitches yield a stronger overall contraction than a single twitch?arrow_forwardFigure 13.22 To what structures in a skeletal muscle are the endoneurium, perineurium, and epineurium comparable? Figure 13.22 Close-Up of Nerve Trunk Zoom in on this slide of a nerve trunk to examine the endoneurium, perineurium, and epineurium in greater detail (tissue source: simian). LM × 1600. (Micrograph provided by the Regents of University of Michigan Medical School © 2012)arrow_forward
- Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.arrow_forwardSkeletal muscle contraction requires _________. a. calcium ions b. ATP c. arrival of a nerve impulse d. all of the abovearrow_forwardYou are training athletes for the 100-meter dash. They need muscles specialized for speed and strength, not endurance. What muscle characteristics would your training regimen aim to develop? How would you alter it to train a long-distance swimmer?arrow_forward
- Skeletal muscle has several distinct fiber types. Type I is used primarily for aerobic activity, whereas type II b is specialized for short, intense bursts of activity. How could you distinguish between these types of muscle fiber if you viewed them with an electron microscope?arrow_forwardSkeletal muscle has several distinct fiber types. Type I is used primarily for aerobic activity, whereas type IIb is specialized for short, intense bursts of activity. How could you distinguish between these types of muscle fiber if you viewed them with an electron microscope?arrow_forwardAfter death, a person no longer makes ATP, and calcium stored in the specialized endoplasmic reticulum of muscle fibers diffuses down its concentration gradient into the muscle cytoplasm. The result is rigor mortis—an unbreakable state of muscle contraction. Explain why the contraction occurs and why it is irreversible.arrow_forward
- Skeletal muscle fibres are very metabolically active and are adapted to create a lot of ATP from aerobic cellular respiration. Additionally, cells require other things to stay alive. Explain how the following three organ systems contribute to allowing a muscle cell to carry out its roles: a) Respiratory system b) Cardiovascular system c) Gastrointestinal system asap please.arrow_forwardSkeletal 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 usearrow_forwardHow quickly would skeletal muscle fibers fatigue if they were unable to use oxygen to make ATP? approximately 15 seconds Approximately 30 seconds Approximately 60 seconds Approximately 100 seconds approximately 180 secondsarrow_forward
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