PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The action potential that triggers a contraction travels deep into a muscle fiber by means of
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Sarcoplasmic reticulum
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Transverse Tubules
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Mitochondria
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Motor end Plates
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Explanation:
Detailed explanation-1: -The action potential that triggers a muscle contraction travels deep within the muscle cell by means of: (1) Sarcoplasmic reticulum.
Detailed explanation-2: -To reach the myofibrils, some of which are located deep in the muscle fibre, the muscular action potential travels through the T-tubule system (the “T” stands for “transverse"), which starts in the sarcolemma and penetrates into the heart of the fibre.
Detailed explanation-3: -Transverse tubules, or t-tubules, are responsible for carrying action potentials into the muscle to ensure that the entire muscle becomes depolarized and contracts as required.
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