To convert ATP into mechanical force for movement
Explication
Skeletal muscle converts chemical energy from ATP into mechanical work, allowing force production and movement. The other options describe functions of other tissues or systems.
Generating movement and force by converting ATP into mechanical work
Explication
Skeletal muscle's main function is to generate movement and force by converting chemical energy from ATP into mechanical work, which underlies body mobility. The other options describe different cellular processes not specific to skeletal muscle.
Excitability and contractility
Explication
Excitability is the ability to detect a stimulus and respond, while contractility is the ability to generate forceful contraction when stimulated. The other pairs are not muscle properties.
Generating movement and force by converting ATP into mechanical work
Explication
Skeletal muscle's main role is to generate movement and force by converting chemical energy from ATP into mechanical work, which underlies body mobility and force exertion.
They differ in cell structure, location, function, and how contraction is triggered
Explication
Skeletal, smooth, and cardiac muscle differ in structure, location, function, and the mechanism that triggers contraction. The other choices describe incomplete or inaccurate comparisons.
In the early 20th century, around 1900-1920.
Explication
The detailed understanding of ATP's role in muscle contraction and force generation was established through scientific research in the early 20th century, particularly with the development of muscle physiology as a scientific discipline during that time.
Elasticity
Explication
Elasticity is the ability of muscle fibers to return to resting length after stretch. Extensibility is the ability to be stretched, not the ability to rebound.
The motor unit includes the motor neuron and all the muscle fibers it innervates, while the neuromuscular junction is the specific synapse where the motor neuron contacts a muscle fiber.
Explication
The motor unit comprises the motor neuron and the muscle fibers it controls, whereas the neuromuscular junction is the specialized synapse where the nerve terminal contacts a muscle fiber, facilitating signal transmission.
Hugh Huxley
Explication
Hugh Huxley is credited with elucidating the detailed organization of sarcomeres and the arrangement of thick and thin filaments in skeletal muscle, which was fundamental in understanding muscle contraction.
It facilitates the rapid release of calcium from the sarcoplasmic reticulum into the cytosol.
Explication
The triad, composed of a T tubule and two terminal cisternae, allows electrical signals from the T tubules to trigger calcium release from the sarcoplasmic reticulum, which is essential for muscle contraction.
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Muscle tissue — definition?
Body tissue made of contractile cells.
Skeletal muscle function
Generate force for movement and support.
Skeletal muscle — role?
Generates movement and force via ATP conversion.
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