https://padlet.com/avarob421/6fw8mtoammaq Muscle Events en-us 2019-03-08 13:17:56 UTC 2024-11-20 09:51:26 UTC hello@padlet.com avarob421 https://padlet.com/avarob421/6fw8mtoammaq/wish/339277547 The action potential causes calcium channels to open and allow calcium ions to enter neuron. Increase in calcium releases ACh into the cleft. ACh leads to activation of voltage gated sodium channels that pumps Na+ in and K+ out. More sodium is pumped in that K+ is pumped out causing depolarization. The depolarization initiates the action potential that moves down the sarcolemma. The K+ voltage gated channels open and K+ diffuses out of sarcolemma which is repolarization. ]]> 2019-03-08 13:23:41 UTC https://padlet.com/avarob421/6fw8mtoammaq/wish/339277547 avarob421 https://padlet.com/avarob421/6fw8mtoammaq/wish/339277603 Step 1:  The action potential moves down the sarcolemma and down the T tubules.

 

]]> 2019-03-08 13:23:48 UTC https://padlet.com/avarob421/6fw8mtoammaq/wish/339277603 avarob421 https://padlet.com/avarob421/6fw8mtoammaq/wish/339890902 Step 2: Transmission of action potential along T tubules cause the adjacent sarcoplasmic reticulum (SR) to release Ca2+ which flows into cytosol. ]]> 2019-03-11 11:46:47 UTC https://padlet.com/avarob421/6fw8mtoammaq/wish/339890902 avarob421 https://padlet.com/avarob421/6fw8mtoammaq/wish/339890983 Step 3 and 4: Ca2+ combines w/ troponin and removes the blocking action of tropomyosin by changing the shape of actin so that the myosin binding sites are exposed. Myosin binds to actin forms cross bridge and contraction be  

]]> 2019-03-11 11:47:01 UTC https://padlet.com/avarob421/6fw8mtoammaq/wish/339890983 avarob421 https://padlet.com/avarob421/6fw8mtoammaq/wish/339891025 step 1: Energized myosin head attaches to actin myofilament forming cross bridge head. 

]]> 2019-03-11 11:47:11 UTC https://padlet.com/avarob421/6fw8mtoammaq/wish/339891025 avarob421 https://padlet.com/avarob421/6fw8mtoammaq/wish/339891090 Step 4: ATP hydrolyzed to ADP & Pi the myosin head returns to prestroke high energy or cocked position.]]> 2019-03-11 11:47:22 UTC https://padlet.com/avarob421/6fw8mtoammaq/wish/339891090 avarob421 https://padlet.com/avarob421/6fw8mtoammaq/wish/339891127 Step 3: After ATP attaches to myosin the line between myosin and actin weakens & myosin head detaches. ]]> 2019-03-11 11:47:27 UTC https://padlet.com/avarob421/6fw8mtoammaq/wish/339891127 avarob421 https://padlet.com/avarob421/6fw8mtoammaq/wish/339891166 step 2: The power stroke. ADP & P are released and myosin head pivots/ bends changing to its bent low energy state which allows actin filament pulling towards M line.]]> 2019-03-11 11:47:33 UTC https://padlet.com/avarob421/6fw8mtoammaq/wish/339891166