https://padlet.com/ausleo556/i58o6bh5zu6e en-us 2018-01-12 17:27:32 UTC 2025-12-03 21:34:25 UTC hello@padlet.com ausleo556 https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221059343 Event 1 of 3 consist of the Neuromuscular Junction releasing an action potential thus causing gated calcium ions to enter the neuron. This causes an increase in acetylcholine that is released in the cleft. Depolarization spreads opening voltage gated sodium channels initiating an action potential that moves along sarcolemma. Na+ concentrations stimulate a change in membrane permeability by opening voltage gated k+pumps which diffuse K+ and causes repolarization]]> 2018-01-12 17:34:34 UTC https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221059343 ausleo556 https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221784516 Step 1:  Th Action Potential from Event 1 moves down the sarcolemma and down the T-tubules. 

 

]]> 2018-01-16 16:52:55 UTC https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221784516 ausleo556 https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221788992 Step 2: Transmission of the action potential along the T-tubules cause the adjacent sarcoplasmic reticulum (SR) to release Ca2+ which flows into the cytosol ]]> 2018-01-16 17:02:25 UTC https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221788992 ausleo556 https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221789017 Step 3 and 4: Ca2+ combines with troponin and removes the blocking action of tropomyosin by changing the shape of the actin so that the myosin binding sites are exposed. 
Myosin binds to actin forms cross bridges and contractions begin.]]> 2018-01-16 17:02:30 UTC https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221789017 ausleo556 https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221792377 step 1: Cross Bridge Formation: high-energy myosin heads attaches to actin myofilaments forming a cross bridge  

]]> 2018-01-16 17:10:05 UTC https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221792377 ausleo556 https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221792479 Step 4: Cocking of myosin head:energy from hydrolysis of ATP "cocks" myosin heads into high-energy state.]]> 2018-01-16 17:10:16 UTC https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221792479 ausleo556 https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221792520 Step 3: Cross Bridge Detachment: ATP attaches to myosin head, causing cross bridge to detach]]> 2018-01-16 17:10:21 UTC https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221792520 ausleo556 https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221792551 step 2: Working (Power) Stroke: myosin head pivots and pulls actin filaments toward M-line]]> 2018-01-16 17:10:26 UTC https://padlet.com/ausleo556/i58o6bh5zu6e/wish/221792551