Assume you have a 10-lb weight in your right hand. Explain why it is easier to flex the right elbow when your forearm is supinated than when it is pronated.
What type of lever system do the following activities describe?
(a) The soleus muscle plantar flexes the foot.
(b) The deltoid abducts the arm.
(c) The triceps brachii is strained while doing pushups.
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