Multiple Choice
Which muscle group is primarily responsible for extending the knee joint?
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10. Muscles
Muscle Actions
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What is the primary action of the triceps brachii muscle at the elbow joint?
A
Supination of the forearm
B
Flexion of the forearm at the elbow
C
Abduction of the arm at the shoulder
D
Extension of the forearm at the elbow
Verified step by step guidance1
Identify the anatomical location and function of the triceps brachii muscle. It is located on the posterior side of the upper arm, spanning from the scapula and humerus to the ulna.
Recall the primary movement actions at the elbow joint, which include flexion (bending) and extension (straightening) of the forearm.
Understand that the triceps brachii muscle's main role is to extend the forearm at the elbow, meaning it straightens the arm by increasing the angle between the forearm and the upper arm.
Differentiate this action from other movements such as supination (rotating the forearm so the palm faces up), flexion (bending the elbow), and abduction (moving the arm away from the body at the shoulder), which are performed by other muscles.
Conclude that the primary action of the triceps brachii at the elbow joint is extension of the forearm, which is the movement that straightens the elbow.
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