Calcium is the trigger for contraction of all muscle types. How does its binding site differ in skeletal and smooth muscle fibers?

How would muscle contractions be affected if skeletalmuscle fibers did not have T-tubules?

Why calcium is important in skeletal muscle contraction?

What is the process of an action potential in muscle tissue?

What is the most outer covering (made up of areolar connective tissue sheath) of a muscle fiber called?     endomysium     perimysium     epimysium     sarcolemma What do synaptic vesicles of a neuromuscular junction contain?     sodium     serotonin     calcium     acetylcholine

Where would you expect to find the greatest concentration of calcium in resting skeletal muscle ?

What prevents the filaments from sliding back to their original position each time a myosin cross bridge detaches from actin?

2 a) What does calcium do in a skeletal muscle cell and where in the cell does it come from?                   b) John’s Stetson (his hat) blew off his head in a strong wind and he sprinted down the hill to retrieve it.  Where did his ATP come from in the first 6 seconds and the next 8 seconds of his run?

Cofilin preferentially binds to older actin filamentsand promotes their disassembly. How does cofilin distin-guish old filaments from new ones?

If calcium cannot be returned to the SR quickly after a muscle contraction, how would this affect muscle function?