Textbook Question
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
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 12c
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.
Verified step by step guidance1
Understand the concept of motor units: A motor unit consists of a single motor neuron and all the muscle fibers it innervates. The size of a motor unit determines the level of control over muscle movement.
Recall that muscles requiring precise control, such as those in the fingers or eyes, have small motor units. This allows for fine-tuned movements because fewer muscle fibers are activated per motor neuron.
Contrast this with muscles that perform gross movements, such as those in the legs or back, which have large motor units. These muscles do not require as much precision but need to generate more force.
Evaluate the given statement: 'Muscles that require a great deal of precise control will have large motor units.' This statement is false because precise control is associated with small motor units, not large ones.
Correct the statement: 'Muscles that require a great deal of precise control will have small motor units.' This correction aligns with the physiological principle of motor unit size and control.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Motor Units
A motor unit consists of a motor neuron and the muscle fibers it innervates. The size of a motor unit can vary; smaller motor units are typically involved in fine motor control, while larger units are associated with gross movements. Understanding motor units is essential for grasping how muscles function in different tasks.
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Precision in Muscle Control
Precision in muscle control refers to the ability to perform tasks that require fine movements, such as writing or playing a musical instrument. Muscles that require high precision typically have smaller motor units, allowing for more refined and controlled contractions. This concept highlights the relationship between motor unit size and the level of control needed for specific activities.
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True/False Statements in Biology
In biology, true/false statements often assess understanding of concepts and relationships within the subject. Correcting false statements requires a clear grasp of the underlying principles, such as the relationship between motor unit size and muscle control. This skill is crucial for evaluating knowledge and ensuring accurate comprehension of biological functions.
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Related Practice
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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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
Which of the following energy sources would provide the majority of the ATP for a person running a 26-mile marathon?
a. Stored ATP
b. Glycolytic catabolism
c. Oxidative catabolism
d. Creatine phosphate
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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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