Domanda del libro di testo
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.
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Ch. 10 Muscle Tissue and Physiology
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814
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TOC.tableOfContents
- Ch. 1 Introduction to Anatomy and Physiology24
- Ch. 2 The Chemistry of Life37
- Ch. 3 The Cell54
- Ch. 4 Histology46
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System35
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System41
- Ch. 13 The Peripheral Nervous System41
- Ch. 14 The Autonomic Nervous System and Homeostasis31
- Ch. 15 The Special Senses39
- Ch. 16 The Endocrine System42
- Ch. 17 The Cardiovascular System I: The Heart28
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity41
- Ch. 21 The Respiratory System27
- Ch. 22 The Digestive System27
- Ch. 23 Metabolism and Nutrition7
- Ch. 24 The Urinary System39
- Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814Non è quello che usi tu?Cambia libro di testo
Capitolo 10, Problema 13
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
Guida verificata passo dopo passo1
Understand the classification of muscle fibers: Muscle fibers are categorized into different types based on their contraction speed, metabolic properties, and myosin ATPase activity. The main types are Type I, Type IIa, and Type IIx fibers. Note that Type III fibers are not a recognized category in human muscle physiology.
Recall the characteristics of Type I fibers: These are slow-twitch fibers that have low myosin ATPase activity, meaning they hydrolyze ATP at a slower rate. This contributes to their slower contraction speed. They are highly resistant to fatigue and rely primarily on aerobic metabolism.
Compare with Type II fibers: Type IIa fibers are fast-twitch fibers with intermediate myosin ATPase activity and a mix of aerobic and anaerobic metabolism. Type IIx fibers are also fast-twitch but have high myosin ATPase activity and rely predominantly on anaerobic metabolism. Both are faster and less fatigue-resistant than Type I fibers.
Eliminate incorrect options: Since Type IIa and Type IIx fibers have higher myosin ATPase activity and faster contraction speeds, they do not fit the description of slow-twitch fibers with low myosin ATPase activity. Type III fibers are not a valid category, so they can also be eliminated.
Conclude that Type I fibers are the correct answer: Based on their low myosin ATPase activity, slow contraction speed, and reliance on aerobic metabolism, Type I fibers are classified as slow-twitch fibers.
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Muscle Fiber Types
Muscle fibers are categorized into different types based on their physiological and biochemical properties. The primary types are Type I (slow-twitch) and Type II (fast-twitch), with Type II further divided into IIa and IIx. Type I fibers are known for their endurance capabilities, while Type II fibers are more suited for explosive movements.
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The Muscle Fiber
Slow-Twitch Fibers
Slow-twitch fibers, or Type I fibers, are characterized by their high endurance and low fatigue rates. They have a rich supply of blood vessels and mitochondria, allowing for efficient aerobic metabolism. These fibers are primarily used in activities requiring sustained effort, such as long-distance running.
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03:00Protein Fibers
Myosin ATPase Activity
Myosin ATPase activity refers to the enzyme's ability to hydrolyze ATP, which is crucial for muscle contraction. Fibers with low myosin ATPase activity, like Type I fibers, contract more slowly and are more efficient in using oxygen for energy. In contrast, fast-twitch fibers (Type II) have higher ATPase activity, enabling quicker contractions but less endurance.
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Percorso guidato
02:37Active Transport
Pratica correlata
Domanda del libro di testo
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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Domanda del libro di testo
Which of the following is not likely to result from endurance training alone?
a. Increase in oxidative enzymes in the muscle fiber
b. Increased numbers of mitochondria
c. Hypertrophy of the muscle fibers
d. Increase in blood supply to the muscle fibers
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Domanda del libro di testo
Resistance-type activities will likely rely on _______ energy sources, whereas endurance activities will probably rely on _____ energy sources.
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Domanda del libro di testo
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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Domanda del libro di testo
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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