Using Approximately 250 Words: Describe Which Motions And Mu

Question

Using Approximately 250 Words Describe Which Motions And Muscles In T To perform the actions involved in turning a doorknob clockwise, pushing open a door, and reversing these motions, multiple muscles and joint motions in the right elbow, forearm, wrist, and hand are engaged. When turning the doorknob clockwise, wrist pronation and supination, along with finger flexion, are primarily involved. The primary muscles responsible include the pronator teres and pronator quadratus for pronation of the forearm, while the flexor muscles of the forearm, such as the flexor digitorum superficialis and flexor pollicis longus, facilitate grip strength (Floyd, 2014). The wrist stabilizers, like the wrist flexors and extensors, assist in maintaining control during rotation (Floyd, 2014). The actions of flexion and slight ulnar deviation assist when pushing the door open, engaging muscles like the flexor carpi ulnaris and flexor digitorum profundus. When reversing the motion—turning the doorknob counter-clockwise and pulling the door—the roles of these muscles change accordingly. For counter-clockwise rotation, the supinator muscle, along with the biceps brachii, is engaged to supinate the forearm, along with continued activation of finger flexors and wrist stabilizers. When pulling the door, shoulder muscles such as the latissimus dorsi and biceps work in conjunction with forearm flexors and finger flexors to exert force and open the door (Floyd, 2014). Understanding these muscle actions highlights the importance of coordinated muscle activity for everyday functional movements.

Dr. Jack HW Helper · Accepted Answer

The actions involved in turning a doorknob and opening or closing a door require complex coordination among various muscles and joint motions in the right elbow, forearm, wrist, and hand. These movements utilize a combination of flexion, extension, pronation, supination, and grip strength, engaging multiple muscular groups that work together to perform these common tasks efficiently and safely. When turning a doorknob clockwise, the primary motion at the forearm is pronation, which rotates the palm downward, enabling the hand to grasp and turn the knob. The muscles primarily responsible for pronation include the pronator teres and pronator quadratus. The brachioradialis, although primarily a flexor of the elbow, assists in stabilizing the forearm during this motion. The muscles of the hand, such as the flexor digitorum superficialis and flexor pollicis longus, facilitate a firm grip on the knob, allowing efficient rotation (Floyd, 2014). Additionally, wrist stabilizers, including the flexor carpi ulnaris and extensor carpi radialis, contribute to maintaining wrist position during these motions. Conversely, when turning the doorknob counter-clockwise, supination occurs, which is the rotation of the forearm that turns the palm upward. The primary muscles involved in supination are the supinator muscle and the biceps brachii. The biceps brachii, in particular, is a powerful supinator when the forearm is flexed. During this action, the grip muscles remain engaged to sustain the hold on the doorknob. While pulling open a door, the shoulder muscles such as the latissimus dorsi and pectoralis major work alongside the biceps brachii and forearm flexors to generate force. The hand muscles work to maintain grip and control the movement (Floyd, 2014). In summary, the motions of turning a doorknob clockwise and counter-clockwise involve intricate coordination among muscles responsible for forearm rotation, grip, wrist stabilization, and elbow flexion. The proper functioning and

Using Approximately 250 Words: Describe Which Motions And Mu

Using Approximately 250 Words Describe Which Motions And Muscles In T

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Using Approximately 250 Words Describe Which Motions And Muscles In T

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