WebAnatomy: Muscle Physiology

Which of the following are true/false when and muscle cell is relaxed.

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WebAnatomy - Muscular System

 1. The troponin and tropomyosin system is bound to actin molecules.


 2. The troponin and tropomyosin system has calcium ions attached to it.


 3. Acetyl Choline (ACh) molecules are located in the receptors on the motor end plate.


 4. The myosin cross bridges come in contact with the actin molecules.


 5. Calcium is in high concentration in the SR - and low concentration inside the muscle cell.

 6. The troponin and tropomyosin system is bound to the motor end plate.


 7. Acetyl Choline ester-ase (AChE) is secreted by the motor neuron.


 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.


 9. The motor neuron does NOT secrete any NTS in order to activate relaxation.


 10. There are NTSs in the receptors on the motor end plate.


 

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