Fill in the blanks (underlined) on the following sentences to describe how the sliding filament model works.
My brain sends an action potential along the _____________________________ _____________________________ until it synapses with a muscle cell in my arm. receptors in the muscle cell are _____________________________ _____________________________ _____________________________, so when the motor neuron releases
_____________________________ into the synapse, the channels open up and create a rush of sodium into the cell, which if it's strong enough will cause nearby voltage-gated sodium channels to open as well. the action potential zips along a muscle cell's membrane, called the _____________________________, which has lots of tubes that run deep inside the cell, called _____________________________. When an action potential travels down one t-tubules it eventually triggers the voltage sensitive proteins that are linked those calcium channels on the cell’s _____________________________ _____________________________. when the sarcoplasmic reticulum channels are thrown open, the calcium stored inside rushes into the rest of the cell. The protein _____________________________ loves to bind with calcium, which changes its shape. The calcium latches onto the troponin and causes it to pull _____________________________ away from the sites on the _____________________________ strands that the _____________________________ wants to attach to. Only myosin heads that have a molecule of _____________________________ broken down into
_____________________________ and leftover _____________________________ can bind to newly exposed sites. when the myosin finally binds to actin, the myosin releases all of the stored energy and changes _____________________________. By changing shape it pulls on the actin strand and in the process it _____________________________ the whole sarcomere, and _____________________________ the muscle. Once the _____________________________ is spent, the myosin has no use for the ADP in the phosphate, so they unbind. The unbinding causes a small change in shape which allows a fresh ATP to bind to the myosin head. This _____________________________ causes another shape change and causes the _____________________________ to release the _____________________________. Meanwhile, the _____________________________ pumps are working hard to restock the calcium and the sarcoplasmic reticulum, so they start grabbing the _____________________________ that is floating around, causing calcium to unbind from _____________________________. When it un binds, the shape change puts the _____________________________ back into place.