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1. In relaxed muscle, the myosin-binding site on actin is blocked by ________.
 
 
 
 

Question 1 of 9

2. According to the sliding filament model, binding sites on actin open when ________.
 
 
 
 

Question 2 of 9

3. The cell membrane of a muscle fiber is called ________.
 
 
 
 

Question 3 of 9

4. Muscle relaxation occurs when ________.
 
 
 
 

Question 4 of 9

5. During muscle contraction, the cross-bridge detaches when ________.
 
 
 
 

Question 5 of 9

6. Thin and thick filaments are organized into functional units called ________.
 
 
 
 

Question 6 of 9

7. Critical Thinking: How would muscle contractions be affected if skeletal muscle fibers did not have T-tubules?

Question 7 of 9

8. Critical Thinking: What causes the striated appearance of skeletal muscle tissue?

Question 8 of 9

9. Critical Thinking: How would muscle contractions be affected if ATP was completely depleted in a muscle fiber?

Question 9 of 9