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When does a muscle perform an action, during contraction or relaxation?
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10. Muscles
Muscle Actions
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Which muscle is primarily responsible for flexing the elbow?
A
Pectoralis major
B
Deltoid
C
Triceps brachii
D
Biceps brachii
Guida verificata passo dopo passo1
Begin by identifying the location and function of each muscle listed in the options. The pectoralis major is located in the chest and primarily functions to adduct and medially rotate the arm.
Consider the deltoid muscle, which is located on the shoulder. Its primary function is to abduct the arm, not flex the elbow.
Examine the triceps brachii, which is located on the back of the upper arm. Its main function is to extend the elbow, the opposite of flexing.
Focus on the biceps brachii, which is located on the front of the upper arm. This muscle is primarily responsible for flexing the elbow joint.
Conclude that the biceps brachii is the correct answer, as it is the muscle primarily responsible for flexing the elbow, based on its anatomical position and function.
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