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 8TY
As you clasp your hands in front of you and push them toward each other, this is an example of:
a. an isotonic contraction
b. an isometric contraction
c. a tetanic contraction
d. aerobic training
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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.
If a muscle cell had very short T-tubules, how much tension would the muscle fiber create, relative to a normal muscle fiber? Assume sarcoplasmic reticulum can still react to activity at the neuromuscular junction.
a)Less tension would be created.
b) No difference in tension creation.
c) More tension would be created.
d) No tension would be created.
Which of the following statements about skeletal muscle is CORRECT?
Select one:
a. An increase in Na+ concentration in the cytosol starts muscle filament sliding.
b. The muscle is non-striated and involuntary.
c. The muscle is involved in shivering thermogenesis.
d. The muscle contracts in response to parasympathetic stimulation.
e. The muscle contracts in response to hormones.
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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- Which of the following statements describes smoothmuscle cells?a. They are resistant to fatigue.b. They have a rapid onset of contractions.c. They cannot exhibit tetanus.d. They primarily use anaerobic metabolism.arrow_forwardUnlike 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 contractarrow_forwardThrough which ATP-generating mechanism can long-lasting muscle contractions be sustained? a. oxidative catabolism b. glycolysis c. creatine phosphate reaction d. anaerobic catabolismarrow_forward
- Muscle relaxation occurs when ________. a. calcium ions are actively transported out of the sarcoplasmic reticulum b. calcium ions diffuse out of the sarcoplasmic reticulum c. calcium ions are actively transported into the sarcoplasmic reticulum d. calcium ions diffuse into the sarcoplasmic reticulumarrow_forwardWhen 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 choice lists the components of a muscle from the smallest unit to the largest unit? A. myofibril, filament, sarcomere, muscle fiber B. filament, sarcomere, myofibril, muscle fiber C. sarcomere, filament, muscle fiber, myofibril D. muscle fiber, filament, sarcomere, myofibrilarrow_forward
- muscle cells are made up of? A. Z bars b. actin c. myosin d. myofibrilsarrow_forwardWhich of the following changes takes place when a skeletal muscle contracts?A. Z discs move farther apart.B. Actin filaments contract.C. Myosin filaments contract.D. Sarcomeres become shorter.arrow_forwardThe sliding filament mechanism describes the process during which: a. actin and myosin slide relative to each other b. sarcomeres slide relative to each other c. troponin and tropomyosin slide relative to each other d. muscle fibers slide past each otherarrow_forward
- This thick filament motor protein composed of 6 polypeptide chains uses ATP hydrolysis to interact creating a powerstroke for skeletal muscle contractions. A Myosin B Actin C Titin D Tropomyosinarrow_forwardexplain why a person bringing 50 kg sack of rice will not move in the same speed and duration as one running in a marathon based on the concept of skeletal muscle contractionarrow_forwardOutline the role of calcium ions on muscle contraction during a biceps curl. In your answer: A) Describe the role of the nervous system in stimulating the release of calcium ions. b) Outline the role calcium ions play in the 'sliding filament theory?'arrow_forward
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