What caused the muscle fatigue you experience with each successive trial? Depletion of actin in the muscle cells .... Depletion of ATP in the muscle cells .... Depletion of calcium in the muscle cells .... Depletion of neurotransmitters from the motor neurons .... Question 2 What would happen if blood flow was restricted to the leg during the wall sits? .... The decrease in nutrients would reduce ATP production and increase muscle fatigue. ..... The decrease in oxygen would reduce ATP production and increase muscle fatigue. .... The decrease in oxygen would cause a shift to anaerobic respiration in the muscle resulting in an increase in ATP production, thereby decreasing muscle fatigue. .... There would be no effect on muscle fatigue ..... Question 3 .... How do banding patterns change when a muscle fiber contracts .... The A-band shortens and the I-band lengthens.... The A-band shortens and the I-band stays the same length. .... The A-band stays the same length and the I-band lengthens. ..... The A-band stays the same length and the I-band shortens. ... Question 4 .... At what point in skeletal muscle contraction is ATP used? ... Performing a power stroke ..... Changing the conformation of the tropomyosin.... Forming crossbridges between the thick and thin filaments .... None of the above ..... Question 5 .... If you experience any muscle soreness after performing these trials, what is the source of this soreness?..... Build up of acetic acid in the muscle cells ..... Damage to the muscle fibers ..... A build up of lactic acid in the muscle cells .... Depletion of ATP...... Question 6 .... How does muscle strength increase? ..... Increase in amount of ATP in muscle cells..... Increase in number of motor neurons ..... Increase in size of muscle fibers ....... Increase in number of muscle fibers .... Question 7 ..... Why does the two-minute rest period between trials allow the muscles to recover slightly?..... It gives the motor neurons time to generate more neurotransmitters ..... It gives the muscle cells time to repair damage caused by the strenuous activity ..... It gives the muscle cells time to produce more ATP ..... It gives the muscle cells time to transport more calcium into the cell ...... Question 8 ..... How would the results of this experiment differ between a sedentary person and an athelete? .... The sedentary person would experience muscle fatigure more quickly than the athlete. ...... The athlete would experience muscle fatigue more quickly than the sedentary person. ....... There would be no difference in the time until muscle fatigure between the sedentary person and the athlete .... The athelete would initially have a longer time until muscle fatigue, but as the trials progress both the athelete and the sedentary person would experience the same time until muscle fatigue .. ..... Question 9 ..... Which type of twitch fiber takes longer to fatigue ..... Fast-twitch. ...... Slow-twitch ....... Question 10 ..... What type of muscle did you utilize in this experiment? ..... Smooth...... Skeletal....... Cardiac