The troponin and tropomyosin system has calcium ions attached to it. True False 3. True False 4. The myosin cross bridges come in contact with the actin molecules. True False 5.
Calcium is in high concentration in the SR - and low concentration inside the muscle cell.
True False 6. The troponin and tropomyosin system is bound to the motor end plate. True False 7. True False 8. Protein molecules inside a sarcomere , such as actin and myosin, are longer when a muscle cell is relaxed, as compared to when it is contracted.