The Golgi tendon organ

[@terrencemartin8033]

Very informative. I believe these mechanisms form the basis of Proprioceptive Neuromuscular Facilititation.

[@mechanismsandlogicinhumanp5840]

Very likely...Stretching of the muscle certainly results in altered responsiveness of the GTO, at least over the short term. Longer term adaptations may require other elements as well.

[@juansamudio1171]

Would biceps be able to reach the descending limb length or do they have to many sarcomere in series that prevents it from involving passive structures?

[@mechanismsandlogicinhumanp5840]

Sorry, I'm not sure I follow the question. Longer muscles would certainly possess myofibrils that have more sarcomeres in series. Each sarcomere can shorten or lengthen by a certain fraction, adding to the amount the entire muscle can shorten or lengthen. Maybe check out the video on the Hill model and see if that answers your question.

[@juansamudio1171]

@@mechanismsandlogicinhumanp5840 just checked it out :) but how would a larger moment arm increase velocity? I’m aware that the muscle will decrease force if velocity increases

[@mechanismsandlogicinhumanp5840]

@@juansamudio1171 Sorry, that's a question for a kinesiologist.