Human Biology : Concepts and Current Issues - With Access
7th Edition
ISBN: 9780321874856
Author: Johnson
Publisher: PEARSON
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Textbook Question
Chapter 6, Problem 14TY
Which type(s) of muscle cells can contract the fastest?
a. smooth muscle cells
b. cardiac muscle cells
c. skeletal muscle cells
d. All muscle cells can exhibit the same speed of contraction.
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Which is a false statement about skeletal muscle structure?a. A myofibril is composed of multiple muscle fibers.b. Most skeletal muscles attach to bones by connective-tissue tendons.c. Each end of a thick filament is surrounded by six thin filaments.d. A cross-bridge is a portion of the myosin molecule.e. Thin filaments contain actin, tropomyosin, and troponin.
In 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.
Which statement about the diagram is not correct?? 
A. All of these illustrations and photos represent muscle cells
B. Illustrations "B" are skeletal muscle which we know from the striations
C. The purple ovals in these illustrations are nuclei
D. Illustrations "C" are smooth muscle cells
Chapter 6 Solutions
Human Biology : Concepts and Current Issues - With Access
Ch. 6 -
1. Do you think we should continue to try to...Ch. 6 - Prob. 2QCCh. 6 - Describe how muscle contraction can resist...Ch. 6 - Describe how a muscle's origin and insertion...Ch. 6 - Describe the roles of calcium in muscle...Ch. 6 -
4. Explain what causes rigor mortis.
Ch. 6 - Prob. 5CRCh. 6 - Prob. 6CRCh. 6 - Prob. 7CRCh. 6 -
8. Compare and contrast how a constant degree of...
Ch. 6 - Prob. 9CRCh. 6 - Prob. 10CRCh. 6 - Prob. 1TYCh. 6 -
2. Which of the following choices arranges the...Ch. 6 - All of the following are functions of the muscular...Ch. 6 -
4. Which of the following happens during muscle...Ch. 6 -
5. Botulism toxin inhibits the release of...Ch. 6 - The sliding filament mechanism describes the...Ch. 6 -
7. What is the first and most direct energy...Ch. 6 - As you clasp your hands in front of you and push...Ch. 6 -
9. All of the following may happen in response to...Ch. 6 - Which of the following is/are characteristic of...Ch. 6 - Which of the following is the site of calcium ion...Ch. 6 - What is the role of ATP in muscle function? a. ATP...Ch. 6 -
13. Which of the following would have motor units...Ch. 6 - Which type(s) of muscle cells can contract the...Ch. 6 - Prob. 15TYCh. 6 - Why do you think it is generally accepted medical...Ch. 6 - Prob. 2AWKCh. 6 - What would happen to a muscle if one of its...Ch. 6 - Prob. 4AWKCh. 6 - Prob. 5AWKCh. 6 - Prob. 6AWKCh. 6 - Prob. 7AWK
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- What aspect of creatine phosphate allows it to supply energy to muscles? ATPase activity phosphate bonds carbon bonds hydrogen bondsarrow_forwardElectromyography is a diagnostic test that measures the electrical activity within muscle fibers. _______________ _______________ _______________ _______________arrow_forwardWhy do you think a person is able to perform anaerobic exercise (such as lifting and holding a heavy weight) only briefly but can sustain aerobic exercise (such as walking or swimming) for long periods? (Hint: Muscles have limited energy stores.)arrow_forward
- Graph a simple muscle twitch and a contraction that results in tetanus.arrow_forwardThrough which ATP-generating mechanism can long-lasting muscle contractions be sustained? a. oxidative catabolism b. glycolysis c. creatine phosphate reaction d. anaerobic catabolismarrow_forwardPredict what might happen to a muscle cell that is extensible but not elastic. What if the reverse were true— a muscle cell is elastic but not extensible?arrow_forward
- Which 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_forwardA.What type of contractions do skeletal muscles do? B. What type of contractions do cardiac muscles do? C.a. What type of contractions do smooth muscles do?arrow_forwardSelect the best answer or answers from the choices given: The function of the T tubules in muscle contraction is to (a) make and store glycogen, (b) release Ca2+ into the cell interior and then pick it up again, (c) transmit the action potential deep into the muscle cells, (d) form proteinsarrow_forward
- Calcium plays a crucial role in the contraction of skeletal muscles. i. Where is calcium stored before muscle contractions? ii. Describe how calcium is released leading up to a muscle contraction. What signal causes the calcium’s release? iii. Describe the role that calcium plays in the muscle contraction. What is it doing to cause changes to sarcomere length?arrow_forwardHow is a muscle cell excited and why does it lead to a contraction in the muscle?arrow_forwardGraph A in this diagram represents A) summation and tetanus of a smooth muscle fibre. C) a simple skeletal muscle twitch c) summation and tetanus of a skeletal muscle fibre. D)simple smooth muscle twitch.arrow_forward
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