Using approximately 400-500 words, describe which motions and muscles in the right elbow, forearm, wrist, and...

Using approximately 400-500 words, describe which motions and muscles in the right elbow, forearm, wrist, and hand are responsible for turning a doorknob clockwise and pushing open a door. What if the motion was reversed and you had to turn the knob counter-clockwise and pull open the door?

Solutions

Expert Solution

The discrepancies in the radioulnar joint muscle and elbow activity between pushing the door open and turning a doorknob clockwise, versus pulling the door open and turning the knob counterclockwise are given below:-

Pushing the door open and turning a doorknob clockwise- using the right hand, this activity requires supination that is accomplished with the concentric activity in the brachioradialis, supinator, and biceps brachii, followed by the anconeus and triceps brachii for the extension of the elbow.
Pulling the door open and turning the knob counterclockwise- using the right hand, this activity requires pronation that is achieved by the concentric activity of the pronator trees, brachioradialis, and pronator quadratus, followed by the brachialis, biceps brachii, and brachioradialis for the flexion of the elbow.

Therefore, the "pushing" action by the elbow joint requires the extension of the elbow, and the doorknob is turned clockwise by the radioulnar joint using pronation. The "pulling" action by the elbow joint requires the flexion of the elbow, and the doorknob is turned counterclockwise by the radioulnar joint using supination.

Sydney Mullin answered 8 months ago

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