Principles of Human Physiology - Mastering A&P
6th Edition
ISBN: 9780134298900
Author: STANFIELD
Publisher: PEARSON
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Textbook Question
Chapter 12, Problem 9E
Which of the following statements concerning the characteristics of different types of muscle fibers is false?
a. The higher the myosin ATPase activity, the faster the speed of contraction.
b. Muscles that have high glycotytic capacity and large glycogen stores are more resistant to fatigue.
c. Oxidative types of muscle fibers contain myoglobin.
d. Oxidative fibers have a richer blood supply.
e. Larger-diameter fibers can produce greater tension.
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Students have asked these similar questions
Which of the following statements best describes the sliding filament mechanism of muscle contraction?
a. Actin and myosin filaments do not shorten, but rather, slide past each other.
b. Actin and myosin filaments shorten and slide past each other.
c. As they slide past each other, actin filaments shorten, but myosin filaments do not shorten.
d. As they slide past each other, myosin filaments shorten, but actin filaments do not shorten.
Unlike skeletal muscle cells, cardiac muscle cells________."
A
do not use the sliding filament mechanism of contraction
B
are not striated
C
do not rely on an influx of Ca+2 for contraction to occur
D
do not require neural stimulation to contract
When a muscle fiber is stretched from 60% of its optimal length to Lo, what change or changes are happening on the cellular level (MULTIPLE SELECT)?
A. Increased calcium release from the SR
B. Increased firing of action potentials from the alpha motor neuron
C. Increased rate of myosin ATPase activity
D. Increased number of actin-myosin bridges
E. Increased stretch on titin, producing more passive force
Chapter 12 Solutions
Principles of Human Physiology - Mastering A&P
Ch. 12.1 - Prob. 12.1.1QCCh. 12.1 -
Which two functions are performed by the heads of...Ch. 12.2 -
Which of the following shortens during a muscle...Ch. 12.2 -
When ATP is hydrolyzed, the conformation of...Ch. 12.2 -
What triggers the power stroke of the crossbridge...Ch. 12.2 -
What is the function of the sarcoplasmic...Ch. 12.2 -
How does an increase or a decrease in the...Ch. 12.3 -
Describe the causes and symptoms of tetanus. Why...Ch. 12.3 - Prob. 2CTQCh. 12.3 - Prob. 3CTQ
Ch. 12.3 - Prob. 12.3.1QCCh. 12.3 -
What is the size principle?
Ch. 12.3 - Prob. 12.3.3QCCh. 12.4 - Prob. 12.4.1QCCh. 12.4 - Prob. 12.4.2QCCh. 12.4 - Prob. 12.4.3QCCh. 12.4 -
How does aerobic exercise affect resistance to...Ch. 12.4 -
What are the criteria used to classify the more...Ch. 12.4 -
Describe the causes of Duchenne and Becker MD....Ch. 12.4 - Prob. 3CTQCh. 12.5 - Prob. 12.5.1QCCh. 12.5 - Prob. 12.5.2QCCh. 12.5 - Prob. 12.5.3QCCh. 12.6 - Prob. 12.6.1QCCh. 12.6 - Prob. 12.6.2QCCh. 12.6 - Prob. 12.6.3QCCh. 12.6 -
What prevents summation of cardiac muscle...Ch. 12 - Prob. 1ECh. 12 - Prob. 2ECh. 12 - Prob. 3ECh. 12 - Prob. 4ECh. 12 - Prob. 5ECh. 12 - Prob. 6ECh. 12 - Prob. 7ECh. 12 - Prob. 8ECh. 12 - Which of the following statements concerning the...Ch. 12 -
Which of the following muscle types contain gap...Ch. 12 - In skeletal muscle, when calcium is released from...Ch. 12 -
When a muscle fiber contracts, the I bands...Ch. 12 - Prob. 13ECh. 12 - Prob. 14ECh. 12 - Prob. 15ECh. 12 - Prob. 16ECh. 12 - Prob. 17ECh. 12 - Prob. 18ECh. 12 - Prob. 19ECh. 12 - Prob. 20ECh. 12 - Prob. 21ECh. 12 - Prob. 22ECh. 12 - Compare and contrast skeletal muscle and smooth...Ch. 12 - Describe the relationship between contractile...Ch. 12 - Prob. 25ECh. 12 - Prob. 26ECh. 12 - Prob. 27ECh. 12 - Prob. 28ECh. 12 - Prob. 29ECh. 12 - Two muscle fibers (X and Y) generate the same...Ch. 12 - Suppose you have a beaker containing a suspension...Ch. 12 - Prob. 32ECh. 12 - Prob. 33E
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- When sarcomeres contract during muscle contraction, which of the following occurs? A. The myosin filaments lengthen. B. The myosin filaments "walk" along the actin microfilaments. C. The myosin filaments shorten. D. The actin filaments shorten.arrow_forwardWhich statement about striated skeletal muscle is true? A. The tension generated by a muscle is invariable. B. Mechanical summation of twitches in a muscle fiber leads to a graded increase in the tension that is above that generated by a single twitch. C. A single action potential arriving at the neuromuscular junction is not sufficient to cause a muscle fiber to twitch. D. Muscle twitches are able to mechanically sum when Ca2+ is quickly and completely removed from the sarcoplasm between action potentials. E. An action potential in the muscle cell activates contraction by releasing Na+ into the sarcoplasm.arrow_forwardIn muscle cells, magnesium ions compete with calcium ions for binding sites on troponin molecules. If a person has too high a concentration of magnesium ions in the blood, magnesium ions can prevent calcium ions from binding troponin. A) What effect would this have on muscle contraction (strengthen, weaken, or no effect)? B) Use your knowledge of how muscle fibers contract to explain your answer in part A.arrow_forward
- All of the following characteristics apply to skeletal muscle except a. They are striated. b. They are multinucleated. c. They are voluntary. d. They contain intercalated discs. e. They are attached to the skeleton by means of tendons.arrow_forwardThe muscles of a professional sprinter are most likely to have ________.a. 80 percent fast-twitch muscle fibers and 20 percent slow-twitch muscle fibersb. 20 percent fast-twitch muscle fibers and 80 percent slow-twitch muscle fibersc. 50 percent fast-twitch muscle fibers and 50 percent slow-twitch muscle fibersd. 40 percent fast-twitch muscle fibers and 60 percent slow-twitch muscle fibersarrow_forwardif, in a laboratory, a skeletal muscle cell receives a single stimulus to contract, it produces a single muscle twitch. If we quickly fire another stimulus for the muscle to contract, prior to the muscle fully relaxing, then we have a condition of: A. seizure B. none of the above C. complete tetanus D. temporal summation E. relaxation The _________________ phase of the Sliding Filament Model of Contraction occurs when myosin and actin separate from one another. A. cocking of the myosin head B. cross bridge detachment C. cross bridge formation D. action potential E. calcium release During contraction, the bulk of calcium comes from the?arrow_forward
- Which of the following statements about the Ca2+ release channels in the sarcoplasmic reticulum is false? a.They are also called ryanodine receptors. b.They are one-tenth the size of the voltage-gated Ca 2+channels. c.They are opened by Ca2+release channels in the transverse tubules. d.They permit Ca 2+ to diffuse into the sarcoplasm from the sarcoplasmic reticulum.arrow_forwardIn a skeletal muscle fiber, Ca2+ is released from a. ACh receptors. b. the motor end plate. c. the sarcoplasmic reticulum. d. the sarcolemma and T-tubules.arrow_forwardOne of the primary reasons that one individual is faster in a 50-meter sprint than another is a. a greater number of muscle fibers of smaller diameter. b. more oxidative fibers in the lower limb muscles. c. an enhanced ability to deliver oxygen to the muscles. d. a greater percentage of fast-twitch fibers in the lower limb muscles.arrow_forward
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