1. What progressive muscle relaxation performed in Two scenarios shown in the picture?

32. After a 3-month period of long slow distance (LSD) training, muscle fiber mitochondria     decrease in number but increase in size     increase in number only     increase in size and number     increase in number but decrease in size

5. Explain what gives muscle a striated appearance and name the myofilaments and the structures involved (Z disk, H band, I band ect.).

32. If a muscle contracts and cause flexion of a limb, another muscle must cause extension of the same limb by relaxing, with no help from any other muscle.  True  False