BIOMECHANICS Daily Activity Analysis : Sipping My Daily Tea

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Most mornings and evenings, I sip hot tea form a cup. When I reach for the cup, my elbow is extended and it moves towards flexion as i move the cup closer to my mouth to sip. The motion of flexion and extension of my elbow happens at a sagittal plane on a frontal axis. The osteokinematics of my elbow is extension to flexion in an open kinematic chain.
Arthrokinematics is the concave surface of the ulna rolls and then glides in the same direction anteriorly on the convex surface of the humerus. The prime mover muscle with this action is the biceps brachii which contracts concentrically during elbow flexion.

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