Muscle Contraction Flow Chart by Desiree Hare https://padlet.com/deshar464/qlu98ugdb587 en-us 2018-01-12 15:02:51 UTC 2024-03-07 19:36:31 UTC hello@padlet.com Event 1 deshar464 https://padlet.com/deshar464/qlu98ugdb587/wish/221719809 Step 1: The brain sends a nerve impulse (action potential) through the motor unit to the neuromuscular junction.
Step 2: The action potential causes voltage gated calcium ion channels to open and calcium ions enter. Acetylcholine is stimulated and is released into the cleft.
Step 3: ACh binds to a Ach receptor and activates voltage gated sodium channels. Na+ is pumped into the cell and K+ is pumped out. The cell interior is then depolarized. 
Step 4: Depolarization spreads and opens voltage gated sodium channels and causes and action potential that moves along the sarcolemma.
Step 5: Na+ concentrations that was caused by depolarization stimulate membrane change and open voltage gated K+ pumps and allow K+ to diffuse across the sarcolemma out of the muscle fiber and cause repolarization. ]]> 2018-01-16 14:41:47 UTC https://padlet.com/deshar464/qlu98ugdb587/wish/221719809 Event 2: EC Coupling deshar464 https://padlet.com/deshar464/qlu98ugdb587/wish/221719852 Step 1:  
Action potential moves down the sarcolemma and down T tubes.
 

]]> 2018-01-16 14:41:53 UTC https://padlet.com/deshar464/qlu98ugdb587/wish/221719852 Event 2: EC Coupling deshar464 https://padlet.com/deshar464/qlu98ugdb587/wish/221719884 Step 2: Transmission of the action potential along the T tubes cause the adjacent sarcoplasmic reticulum and release Ca+2 then flows into cytosol. ]]> 2018-01-16 14:41:58 UTC https://padlet.com/deshar464/qlu98ugdb587/wish/221719884 Event 2: EC Coupling deshar464 https://padlet.com/deshar464/qlu98ugdb587/wish/221719991 Step 3: Ca+2 combines with troponin and removes the blocking action of the tropomyosin by changing shape of the actin so the myosin binding sites are exposed.

]]> 2018-01-16 14:42:11 UTC https://padlet.com/deshar464/qlu98ugdb587/wish/221719991 Event 3: Cross bridge coupling deshar464 https://padlet.com/deshar464/qlu98ugdb587/wish/221720048 step 1: cross bridge formation: energized myosin head attaches to an actin myofilament forming a cross bridge.]]> 2018-01-16 14:42:23 UTC https://padlet.com/deshar464/qlu98ugdb587/wish/221720048 Event 3: Cross bridge coupling deshar464 https://padlet.com/deshar464/qlu98ugdb587/wish/221720078 step 2: ADP and pi are released and the myosin head pivots and bends changing to bent low energy. As a result it pulls the actin filament to the M line.]]> 2018-01-16 14:42:26 UTC https://padlet.com/deshar464/qlu98ugdb587/wish/221720078 event 3: Cross bridge coupling deshar464 https://padlet.com/deshar464/qlu98ugdb587/wish/221720103 Step 3: ATP attaches myosin the line between myosin and actin weaken and the myosin head attaches. ]]> 2018-01-16 14:42:30 UTC https://padlet.com/deshar464/qlu98ugdb587/wish/221720103 Event 3: Cross bridge coupling deshar464 https://padlet.com/deshar464/qlu98ugdb587/wish/221720126 Step 4: As ATP is hydrolyzed to ADP and pi, the myosin head returns to its prestroke high energy.]]> 2018-01-16 14:42:34 UTC https://padlet.com/deshar464/qlu98ugdb587/wish/221720126