PHYSIOLOGY
EXCITATION CONTRACTION COUPLING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following represents the correct sequence of events in a contraction cycle?
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active-site exposure, cross-bridge attachment, myosin reactivation
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active-site exposure, cross-bridge attachment, cross-bridge detachment, myosin reactivation
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cross-bridge attachment, active-site exposure, cross-bridge attachment, cross-bridge detachment, myosin reactivation
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active-site exposure, cross-bridge attachment, cross-bridge detachment, myosin reactivation
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Explanation:
Detailed explanation-1: -(i) The myosin head pulls the actin filament towards the M-line. (ii) The myosin head releases ADP and phosphate. (iii) The myosin head hydrolyses ATP. (iv) The myosin head binds actin.
Detailed explanation-2: -discharge of motor neuron at myo-neural plate (endplate) release of the neurotransmitter acetylcholine at the endplate. binding of acetylcholine to its receptors. increased Na+ and K+ conductance in endplate membrane. generation of action potential at endplate. More items
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