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How many of the following are true when a muscle cell is
1. The troponin and tropomyosin system is bound to myosin 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 z-lines.
7. Actin is secreted by the motor neuron.
8. The H zone of the sarcomere is smaller when it is contracted than when it is relaxed.
9. The motor neuron secretes NTSs (neuro transmitter substances) directly into the sarcomeres.
10. There are NTSs in the receptors on the motor end plate.
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Last modified on November 14, 2005