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Self Tests
How many of the following are true when a muscle cell is CONTRACTED?

Your Answer

Correct Answer

1. The troponin and tropomyosin system is bound to myosin molecules.  True
False
2. The troponin and tropomyosin system has calcium ions attached to it.  True
False
3. Acetyl Choline (ACh) molecules are located in the receptors on the motor end plate.  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 z-lines.  True
False
7. Actin is secreted by the motor neuron.  True
False
8. The H zone of the sarcomere is smaller when it is contracted than when it is relaxed.  True
False
9. The motor neuron secretes NTSs (neuro transmitter substances) directly into the sarcomeres.  True
False
10. There are NTSs in the receptors on the motor end plate.  True
False

 
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