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Three muscles are the major contributors to flexing the forearm: the biceps, the brachioradialis and the...

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Advance Math

Three muscles are the major contributors to flexing the forearm:the biceps, the brachioradialis and the brachialis. Determine theforce in the biceps muscle, the joint reaction force, and the jointmoment at the elbow for an individual holding a 10 kg mass (98.1 N)with its forearm at 90° of flexion. The force in the brachialismuscle is 5 N and in the brachioradialis is 3.6 N.

The following anatomical data isgiven:

Length of forearm and hand: 0.5 m

Mass of forearm and hand: 2 kg

Distance from muscle insertion to elbow:

Biceps: 4 cm

Brachialis: 3.5 cm

Brachioradialis: 20 cm

Angle of muscle at 90° flexion:

Biceps: 80

Brachialis: 68

Brachioradialis: 23

Answer & Explanation Solved by verified expert
3.5 Ratings (527 Votes)
SOLUTIONF 0Fy W W forearm and hand FBRD sin 23 FBIC sin 803 FBRA sin 687 Ry 098    See Answer
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