Concept explainers
To determine: The cause of the maximum amplitude of a stimulated muscle contraction.
Introduction: Muscle contraction is usually stimulated by the motor neurons, which are known as somatic motor neurons. The contraction and the relaxation in muscles are brought by the actin and myosin filaments.
Explanation of Solution
When the somatic motor neuron delivers
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Chapter 45 Solutions
BIOLOGY
- Review the sliding filament model of muscle contractionarrow_forwardExplain Molecular Mechanisms of Skeletal Muscle Contraction?arrow_forwardDefine the all-or-none principle. The same student remarked that at 180 mV stimulus, it is expected that 100 g mass is lifted by the muscle fibre. Do you agree or disagree? Why or why not?arrow_forward
- Describe in detail molecular mechanism of skeletal muscle contraction.arrow_forwardCompare the contraction mechanisms of skeletal andsmooth muscle cells.arrow_forwardExplain in detail: What does the ‘sliding filament model of muscle contraction’ discuss or explain? What are filaments composed of and how do contractions occur, commenting on calcium and ATP process.arrow_forward
- Describe the events that result in the relaxation of skeletal musclefibers?arrow_forwardExplain how the process of skeletal muscle excitation–contraction coupling demonstrates the general principle of physiology that controlled exchange of materials occurs between compartments and across cellular membranes.arrow_forwardDiscuss the Muscle Adaptation to Exercise?arrow_forward
- VISUAL SKILLS What will happen in a muscle cell thathas used up its supply of oxygen and ATP? (ReviewFigures 9.18 and 9.20.)arrow_forwardFatigue is not well understood. Some factors that have been proposed to explain the fall in force duringfatigue include: changes in the 'sense of effort', loss of 'central drive', failure of neuromuscular propagation, reduction in calcium release in excitation- contraction coupling, metabolic changes in the muscle, and reduction in muscle blood flow owing to compression of blood vessels. 1. Do your experiments help to decide which factors are important?arrow_forwardAnalyse the role of antagonist, agonist and synergist muscle and their contractions.arrow_forward
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning