e. Range of motion at a joint 9. The following data were collected by measuring

Question

e. Range of motion at a joint 9. The following data were collected by measuring the range of motion (ROMM) at various joints with a goniometer Measared ROM (mark with 'x for visual estimation Left verage ROM 95 127 55" 89* Abduction Adduction 87 119" 86 120 Elbow Flexion 85* Abduction Adduction 55* 32" Hip 45 26" 55* Flexion 140 145 45 What conclusions can you make about this individual's flexibility? 10. Identify sources of experimental error when measuring the range of motion with a goniometer 11. To demonstrate muscle fatigue, a student held an 8-lb dumbbell in her hand and abducted her upper limb so that it was parallel to the foor. After 45 seconds, she was having trouble holding that position, so she rotated her hand 90°. By doing so, she was able to hold the durabbell in position for an additional 20 seconds. Which of the following statements best explains why the student could do that a. The load was reduced. b. Dfferent motor units were contracting while others were relaxing. c. The resistance to contraction was reduced. d. Muscles began to contract isotonically rather than isometrically e. The change in position provided a greater range of motion at the shoulder 34 EXEROISE 13 Physiology of the Muscular System

Explanation / Answer

11. Different motor units were contracting and the ones that were earlier used are relaxing.

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