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 7TY
What is the first and most direct energy source for muscle contraction?
a. glucose
b. ATP
c. creatine phosphate
d. glycogen
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Through which ATP-generating mechanism can long-lasting muscle contractions be sustained? a. oxidative catabolism b. glycolysis c. creatine phosphate reaction d. anaerobic catabolism
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.
What will happen in a muscle cell that has used up its supply of oxygen and ATP whenyou are exercising? Use a diagram to explain
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_forwardWhich component is responsible for initially stimulating a muscle contraction? a. proteins b. electrochemical signals c. plasma membranes d. striationsarrow_forwardElectromyography is a diagnostic test that measures the electrical activity within muscle fibers. _______________ _______________ _______________ _______________arrow_forward
- 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.arrow_forwardGraph a simple muscle twitch and a contraction that results in tetanus.arrow_forwardWhat is the first and most direct energy source for muscle contraction? a. glucose b. ATP c. creatine phosphate d. glycogenarrow_forward
- 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_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_forwardinvestigate anabolic steroids and their use in sports.b. Determine how they affect skeletal muscle healing and enhance skeletal muscle performance.arrow_forward
- What happens to sarcomeres when actin and myosin filaments in a muscle fiber interact during the contraction phase? A) sarcomeres usually fatigue B) sarcomeres usually get shorter C) sarcomeres usually get longer D) sarcomeres stay the samearrow_forwardHow does calcium release in the muscle fiber result in the cross-bridge for contraction? Use key terms below and identify them on a diagram. Ca+2, troponin, tropomyosin, thin filaments (actin), thick filaments (myosin w/head), cross bridgearrow_forwardWhat is the physiological mechanism that produces a quick and efficient skeletal muscle response to an external stimulus? A. voluntary motor commands from the brain B. temporal and spatial summation C. sensory nerve input to the brain D. spinal reflex arc E. endocrine secretory responsearrow_forward
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