Which of the following option shows correct order of some stages of muscle contraction from the beginning to the end of the process?
(A)stimuli, neurotransmitter secretion, release of Ca2+, cross bridges formation, excitation of T-system, sliding of action filaments
(B)stimuli, neurotransmitter secretion, excitation of T-system, release of Ca2+, cross bridges formation, sliding of actin filaments, H-band diminishesCorrect
(C)stimuli, excitation of T-system, neurotransmitter secretion, cross bridges formation, sliding of action filaments, H-band diminishes
(D)stimuli, neurotransmitter secretion, excitation of T-system, cross bridges formation, sliding of action filaments
Answer: (B)
Solution
The authentic sequence of muscle contraction begins with a stimulus triggering neurotransmitter (acetylcholine) release at the neuromuscular junction, which excites the T-tubule system,
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