Applied anatomy and kinesiology, the mechanism of muscular movement . trunk is used as far aspossible to aid the arms. Grasping the weight as it lies on the floor,it is brought to position (Fig. 165), by the action of the extensorsof the trunk and limbs, the flexors of the hand and the trapeziusalso acting. To come to the next position, seen in Fig. 166, thetrunk is raised with enough speed to give the weight a quick upwardmovement, making it easier for the biceps group to flex the elbow;then to finish the lift the trunk is quickly flexed to the left, theside pushing against the elbow and givi
Applied anatomy and kinesiology, the mechanism of muscular movement . trunk is used as far aspossible to aid the arms. Grasping the weight as it lies on the floor,it is brought to position (Fig. 165), by the action of the extensorsof the trunk and limbs, the flexors of the hand and the trapeziusalso acting. To come to the next position, seen in Fig. 166, thetrunk is raised with enough speed to give the weight a quick upwardmovement, making it easier for the biceps group to flex the elbow;then to finish the lift the trunk is quickly flexed to the left, theside pushing against the elbow and giving the weight another*upward movement. This makes it possible for the triceps and thearm-raising group to bring the arm to position (Fig. 167). Lifting is made easier, as we have seen, by shortening theweight arm of the lever, and more can be lifted with the elbowsflexed, as in Fig. 162 than when they are fully extended, as in and 164. But the extensors of the trunk and limbs are larger andstronger muscles than those of the arms and it is therefore easier. Fig. 165
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