What is the mechanism of muscle contraction? I - The contraction of the skeletal muscle is voluntary and occurs by the sliding of the actin filame...
What is the mechanism of muscle contraction?
I - The contraction of the skeletal muscle is voluntary and occurs by the sliding of the actin filaments over the myosin filaments.
II - During muscle contraction, the sarcomere decreases due to the approximation of the two Z lines, and the H zone disappears.
III - The T-tubule system is responsible for the uniform contraction of each skeletal muscle fiber, not occurring in smooth fibers and being reduced in cardiac fibers.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and II are correct.
e) I, II, and III are correct.
I - The contraction of the skeletal muscle is voluntary and occurs by the sliding of the actin filaments over the myosin filaments.
II - During muscle contraction, the sarcomere decreases due to the approximation of the two Z lines, and the H zone disappears.
III - The T-tubule system is responsible for the uniform contraction of each skeletal muscle fiber, not occurring in smooth fibers and being reduced in cardiac fibers.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and II are correct.
e) I, II, and III are correct.
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💡 1 Resposta
Ed 
A resposta correta é a alternativa "e) I, II, and III are correct." O mecanismo de contração muscular ocorre por meio do deslizamento dos filamentos de actina sobre os filamentos de miosina, que são proteínas contráteis presentes nas fibras musculares. Durante a contração muscular, o sarcomero, que é a unidade contrátil do músculo, diminui de tamanho devido à aproximação das duas linhas Z, e a zona H desaparece. O sistema T-tubular é responsável pela contração uniforme de cada fibra muscular esquelética, não ocorrendo em fibras lisas e sendo reduzido em fibras cardíacas.
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