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Ch. 10 Muscle Tissue and Physiology
Amerman - Human Anatomy & Physiology 2nd Edition
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822Not the one you use?Change textbook
All textbooksAmerman 2nd EditionCh. 10 Muscle Tissue and PhysiologyProblem 17
Chapter 10, Problem 17

Which of the following factors is/are responsible for muscular fatigue?
a. Accumulation of chemicals, including calcium and phosphate ions & increased blood flow to the muscle
b. Decreased availability of oxygen
c. Psychological and environmental factors
d. Depletion of key metabolic fuels, such as creatine phosphate

Verified step by step guidance
1
Understand the concept of muscular fatigue: Muscular fatigue occurs when a muscle loses its ability to contract effectively after prolonged activity. It can result from a combination of physiological, biochemical, and psychological factors.
Analyze option (a): Accumulation of chemicals, such as calcium and phosphate ions, can interfere with muscle contraction by disrupting the balance of ions needed for proper function. However, increased blood flow to the muscle is typically a compensatory mechanism to deliver oxygen and nutrients, not a cause of fatigue.
Analyze option (b): Decreased availability of oxygen can lead to a reliance on anaerobic metabolism, which produces lactic acid and contributes to fatigue. This is a common factor in muscular fatigue during intense or prolonged exercise.
Analyze option (c): Psychological and environmental factors, such as motivation, stress, and temperature, can influence the perception of fatigue and the ability to sustain muscle activity. These factors are often considered contributors to fatigue.
Analyze option (d): Depletion of key metabolic fuels, such as creatine phosphate, reduces the muscle's ability to regenerate ATP, which is essential for muscle contraction. This is a direct physiological cause of muscular fatigue.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Muscular Fatigue

Muscular fatigue refers to the decline in the ability of a muscle to generate force. It can result from various physiological factors, including the accumulation of metabolic byproducts, depletion of energy sources, and impaired neuromuscular function. Understanding the mechanisms behind muscular fatigue is essential for analyzing its causes and effects during physical activity.
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Metabolic Fuels

Metabolic fuels, such as creatine phosphate, glycogen, and fatty acids, are essential for muscle contraction and energy production. During intense exercise, these fuels are depleted, leading to reduced energy availability and contributing to muscular fatigue. Recognizing the role of these fuels helps in understanding how their depletion affects performance and recovery.
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Oxygen Availability

Oxygen availability is crucial for aerobic metabolism, which provides energy for prolonged muscle activity. A decrease in oxygen supply can lead to a shift towards anaerobic metabolism, resulting in the accumulation of lactic acid and other metabolites that contribute to fatigue. This concept highlights the importance of cardiovascular fitness and efficient oxygen delivery during exercise.
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Related Practice
Textbook Question

Which of the following best describes single-unit smooth muscle tissue?

a. The fibers function individually.

b. It is found in organs that require precise control of contraction.

c. It contains gap junctions that couple the fibers electrically.

d. The amount of tension produced varies with the number of muscle cells recruited.

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Textbook Question

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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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

List some of the functions of smooth muscle tissue.

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Textbook Question

What is thought to cause excess postexercise oxygen consumption?

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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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