24 Questions
What is the ability of a muscle to be stretched or to increase in length called?
Extensibility
Which component of muscle provides resistance when the muscle is passively stretched?
Parallel elastic component (PEC)
What is the term for the ability to develop tension by muscle?
Contractility
Which structure acts as a spring to store elastic energy when a tensed muscle is stretched?
Series elastic component (SEC)
What is the specialized cytoplasm of a muscle fiber called?
Sarcoplasm
Which term refers to the membrane surrounding a muscle fiber?
Sarcolemma
What is the main function of the sarcoplasm in each muscle fiber?
To contain the nuclei and mitochondria of the muscle fiber
What is the purpose of the cross-bridges that form between the actin and myosin filaments during muscle contraction?
To generate the force that pulls the actin and myosin filaments towards each other
What is the key difference between fast twitch (FT) and slow twitch (ST) muscle fibers?
FT fibers reach maximum tension more quickly than ST fibers
Why are the slow twitch (ST) motor units the first to be activated, even during rapid limb movements?
ST motor units are innervated by neurons that are easier to activate
Which of the following is a key characteristic of the myofibrils within each muscle fiber?
They are responsible for producing the striated pattern in skeletal muscle
How do the number of cross-bridges formed between actin and myosin filaments relate to muscle function?
The more cross-bridges, the greater the force production and energy expenditure
During low-intensity exercise, which type of muscle fibers are primarily recruited by the central nervous system?
Type I (slow-twitch) fibers
As the intensity of exercise increases and fatigue sets in, which order are the different types of motor units activated?
Type I, Type IIa, Type IIb
What is the maximum amount of force that a muscle can generate before actually lengthening as the resistance is increased?
Maximum isometric tension
During most activities of daily living, which of the following statements is true?
Only the number of motor units required are activated
At what point does maximum muscular power occur?
At one-third of maximum velocity and one-third of maximum concentric force
What is the relationship between muscular force and velocity of muscle shortening?
As muscular force increases, velocity of muscle shortening decreases
What is the primary benefit of warming up before an athletic endeavor?
It increases muscular strength and power
At what temperature is muscle function most efficient?
38.5°C (101°F)
What is the primary reason for the shift in the force-velocity curve when muscle temperature is elevated?
Increased activation of motor units
What is the most appropriate load for training designed to increase muscular power over a range of resistance?
One-third of one maximum repetition
What is the definition of muscular power provided in the text?
The rate of torque production at a joint
What is the potential danger of elevating body temperature beyond 38.5°C (101°F) during strenuous exercise?
Heat exhaustion or heat stroke
Explore the behavioral properties of the musculotendinous unit related to extensibility and elasticity. Learn about the ability of muscles to be stretched and return to normal length after a stretch, crucial for smooth tension transmission.
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