PHYSIOLOGY
SLIDING FILAMENT MODEL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What are the the three things that happen when stimulated by a nervous system?
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cross bridges form..myosin heads attach to active sites on actin subunits
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cross bridge breaks.. myosin heads leave active sites
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crossbridges attach and detach multiple times
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pull actin toward center of sarcomere past thin filaments
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pull actin toward center of sarcomere past thick filament.. shortening of sarcomere and generation of tension
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Explanation:
Detailed explanation-1: -Stimulation of the muscle fibre, causes a wave of depolarisation to pass down the t-tubule, and the SR to release calcium ions into the sarcoplasm. Calcium is pumped back up into the SR to lower calcium ion concentration in the sarcoplasm, to relax the muscle (turn off contraction).
Detailed explanation-2: -Smooth muscle, found in the walls of the hollow internal organs such as blood vessels, the gastrointestinal tract, bladder, and uterus, is under control of the autonomic nervous system.
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