for the following actions, identify a muscle that would act as an agonist, antag
ID: 163939 • Letter: F
Question
for the following actions, identify a muscle that would act as an agonist, antagonist and synergist 8. For the following actions, identify a muscle that would act as an agonist, antagonist, and synergist Action Synergist Agonist Antagonist Flexion of the forearm Abduction of the arm Pronation of the forearm Medial rotation of the arm 9. The brachialis does not act at the shoulder and the coracobrachialis does not act at the elbow joint. Explain why. 10. Explain why the force of gravity will allow you to extend your forearm even if the triceps brachii is not functioning.Explanation / Answer
Q.No 1
Flexion of the forearm matched with a - It is an agonists action
Abduction of the arm matched with f – It is synergist action
Pronation of the forearm matched with h – It is an antagonist action
Medial rotaion of the arm matched with k – It is an antagonist action
Q.No 2
The brachialis is an elbow flexor which is located inferior to the biceps on the upper arm. Biceps are inserts onto the radius and it is easily rotate, whereas brachialis inserts onto the ulna which cannot be rotate. Hence, brachialis is flexor of the elbow joint and does not act at the shoulder and coracobrachialis acts only at the shoulder.
Q.No 3
The biceps brachii is an action associated with agonist for elbow flexion. It is assisted by the brachialis and the brachioradialis. These are capable of flexing the elbow joint to some extent. In case of forearm supination were desired without elbow flexion, the triceps would act isometrically and it resists the flexion and it also making neutralizer.
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