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 12b
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.
Verified step by step guidance1
Understand the concept of wave summation: Wave summation occurs when a muscle fiber is stimulated by a motor neuron before it has completely relaxed from a previous contraction. This leads to an increase in the force of contraction because the effects of successive stimuli are added together.
Analyze the statement: The statement claims that stimulation by a motor neuron before a muscle fiber has fully relaxed results in wave summation. Based on the definition of wave summation, this part of the statement is correct.
Check for any additional inaccuracies: The statement does not include any incorrect information or contradictions regarding the concept of wave summation.
Determine the truth value: Since the statement aligns with the definition of wave summation, it is true.
Conclude: The statement is true, and no corrections are needed.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Wave Summation
Wave summation occurs when a muscle fiber is stimulated by a motor neuron before it has completely relaxed from a previous contraction. This leads to an increase in the strength of the muscle contraction, as the subsequent stimuli add to the force generated by the previous contraction, resulting in a more powerful overall contraction.
Recommended video:
03:50
Summation
Muscle Fiber Relaxation
Muscle fiber relaxation is the process by which a muscle fiber returns to its resting state after contraction. This involves the reuptake of calcium ions into the sarcoplasmic reticulum and the detachment of myosin heads from actin filaments, allowing the muscle to prepare for the next contraction. If a new stimulus occurs before this process is complete, it can lead to wave summation.
Recommended video:
Guided course
7:47The Muscle Fiber
Motor Neuron Stimulation
Motor neuron stimulation refers to the activation of motor neurons that transmit signals from the central nervous system to muscle fibers, causing them to contract. The frequency and timing of these signals are crucial in determining the strength and type of muscle contraction, influencing phenomena such as wave summation and tetanus in muscle physiology.
Recommended video:
Guided course
04:20The Neuron
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
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
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
A muscle fiber relaxes when:
a. The concentration of Ca2+ in the cytosol returns to resting levels.
b. The supply of ATP is exhausted.
c. Ca2+ flood the cytosol.
d. Acetylcholine is released from the axon terminal and the sarcolemma depolarizes.
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