Why do the deltoids need to generate a greater torque when your arm-forearm is c

Question

Why do the deltoids need to generate a greater torque when your arm-forearm is closer to your side versus straight out at 90 degree? a. Because the moment arm of the center or mass of the arm-forearm is larger. b. Because the component of the weight of the arm-forearm that causes a moment is larger. c. The torque is the same because the distance from the shoulder joint to the center of mass of the arm-forearm is constant. d. The torque is less because the moment arm of the center or mass of the arm-forearm is less.

Explanation / Answer

Deltoids need to generate a greater torque when your arm-forearm is closer to your side versus straight because the the torque is less because the moment arm of the center or mass of the arm-forearm is less.

Deltoid is a largest of the glenohumeral muscles and forms the lateral border of shoulder.

There are two types of hand moments,one is fluction and the another is extension. During extension the pressure applied on deltoids is less. Muscle acting on their attachment to boning segments produce internal torque.

The muscles are attached by tendons and liagments .these are bone to bone coonections and bone to muscle connection.

so,much torque is produced in deltoids onlyduring fluctions.

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