Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Muscle fibers generate more tension if the starting length of their sarcomeres is very short.
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Ch. 10 Muscle Tissue and Physiology
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822
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Table of contents
- Ch. 1 Introduction to Anatomy and Physiology26
- Ch. 2 The Chemistry of Life38
- Ch. 3 The Cell55
- Ch. 4 Histology47
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System36
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System42
- Ch. 13 The Peripheral Nervous System41
- Ch. 14 The Autonomous Nervous System and Homeostasis31
- Ch. 15 The Special Senses39
- Ch. 16 The Endocrine System42
- Ch. 17 The Cardiovascular System I: The Heart30
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity45
- Ch. 21 The Respiratory System27
- Ch. 22 The Digestive System27
- Ch. 23 Nutrition and Metabolism7
- Ch. 24 The Urinary System39
- Ch. 25 Fluids, Electrolytes, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Chapter 10, Problem 12d
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
A muscle fiber changes length during isotonic concentric and isotonic eccentric contractions.
Verified step by step guidance1
Understand the key terms: 'isotonic concentric contraction' refers to a type of muscle contraction where the muscle shortens as it generates force, while 'isotonic eccentric contraction' refers to a type of muscle contraction where the muscle lengthens while still generating force.
Analyze the statement: 'A muscle fiber changes length during isotonic concentric and isotonic eccentric contractions.' This implies that the muscle fiber either shortens or lengthens during these types of contractions.
Determine the truth of the statement: Since isotonic concentric contractions involve muscle shortening and isotonic eccentric contractions involve muscle lengthening, the statement is true because the muscle fiber does indeed change length in both cases.
If the statement were false, the correction would involve clarifying that muscle fibers do not remain the same length during isotonic contractions, as they either shorten (concentric) or lengthen (eccentric).
Conclude that the statement is true as written, and no correction is necessary in this case.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Isotonic Contractions
Isotonic contractions are a type of muscle contraction where the muscle changes length while generating force. This includes two subtypes: concentric contractions, where the muscle shortens as it contracts, and eccentric contractions, where the muscle lengthens while still under tension. Understanding these contractions is essential for analyzing how muscles perform during various physical activities.
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4:53
Overview of Muscle Contraction
Muscle Fiber Length Changes
During isotonic contractions, muscle fibers indeed change length. In concentric contractions, the muscle fibers shorten to lift a load, while in eccentric contractions, they lengthen to control the descent of a load. Recognizing this distinction is crucial for understanding how muscles function in different movement scenarios.
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True/False Statement Correction
The task of marking statements as true or false requires critical thinking and comprehension of the underlying principles. If a statement is false, it is important to identify the error and provide a corrected version that accurately reflects the physiological concepts involved. This process reinforces learning and ensures a deeper understanding of muscle mechanics.
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Related Practice
Textbook Question
Which of the following types of muscle fibers have low myosin ATPase activity and are classified as slow-twitch?
a. Type I fibers
b. Type IIa fibers
c. Type IIx fibers
d. Type III fibers
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Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Muscles that require a great deal of precise control will have large motor units.
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Textbook Question
Resistance-type activities will likely rely on _______ energy sources, whereas endurance activities will probably rely on _____ energy sources.
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Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Stimulation by a motor neuron before a muscle fiber has fully relaxed results in a condition called wave summation.
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Textbook Question
Muscle tone is:
a. The result of voluntary shortening of the muscle.
b. The result of a small amount of involuntary activation of motor units by the nervous system.
c. Abnormal—a person's muscles should be relaxed normally.
d. Present only where there is damage to the nervous system.
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