Problemset2Key2007F0

Problemset2Key2007F0 - Biomechanics IPHY 4540 Problem Set#2...

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Biomechanics IPHY 4540 Problem Set #2 Key 1. For each of the muscles below, list what the primary movement that it causes during a concentric action: deltoid: shoulder elevation (= abduction); biceps brachii: elbow flexion; triceps brachii: elbow extension; gluteus maximus: hip extension, vastus medialis: knee extension, soleus: ankle extension (=plantar flexion), masseter: jaw closing (=flexion), erector spinae: back extension. 2. Explain the actions (note plural) of a. the rectus femoris and b. gastrocnemius. Note plural, we are looking for 8 statements = 2 muscles x 2 joints x concentric/eccentric concentric action of RF extends knee and flexes hip (i.e. 2 joint muscle); eccentric action of RF resists flexion of knee and resists extension hip concentric action of gastroc extends ankle (=plantar flexion) and flexes knee (i.e. 2 joint muscle); eccentric action of gastroc resists flexion of ankle (=dorsi flexion) and resists extension of knee 3. Describe using anatomical terms for positions, directions and movements at each of the joints involved for the following: You are driving a stick shift automobile. Begin with both hands on the
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Problemset2Key2007F0 - Biomechanics IPHY 4540 Problem Set#2...

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