6. Motor unit recruitment 7. Muscle flexibility 8. Muscle fatigue a. Condition o

Question

6. Motor unit recruitment 7. Muscle flexibility 8. Muscle fatigue a. Condition of a muscle characterized by its inability to generate a force b. Minimum stimulus required to initiate a muscle fiber contraction c. Activation of increasing numbers of motor units in a muscle d. Motor nerve fiber and all the muscle fibers it controls e. Range of motion at a joint 9. The following data were collected by measuring the range of motion (ROM) at various joints with a goniometer Joint Shoulder Movement Abduction Adduction Flexion 95* 127 119 120 Elbow 55 Extension 85* 45* 26° 140° 55° Hip Abduction Adduction 145 145 Knee Flexion 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 &-lb dumbell in her hand and abducted her upper limb so that it was par floor. After 45 seconds, she was having trouble holding that position, so she rotated her hand 90. By doing so, she was able dumbbell in position for an additional 20 seconds. Which of the following statements best explains why the student could

Explanation / Answer

9) The normal value for shoulder abduction is 180 degrees and adduction is 0. For elbow flexion and extension the range of movements is 150 and 150 respectively. For hip, the range of movements for abduction and adduction are 45 and 30 degrees respectively. The range of movement for knee flexion is 0-135 degrees.

Therefore, the ROM for hip and knee are within normal limits but ROM for shoulder joint and elbow joint is greatly reduced.

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