To bend your arm you must contract this muscle and relax this muscle.

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Study for the Muscular System and Skeletal System Exam. Learn with flashcards and multiple choice questions, where each question has explanations and hints. Be well-prepared and confident on your test day!

Multiple Choice

To bend your arm you must contract this muscle and relax this muscle.

Explanation:
Bending the elbow (elbow flexion) happens when the biceps brachii contracts to pull the forearm up toward the upper arm. For this movement to occur smoothly, the opposing muscle—the triceps brachii—must relax so it doesn’t oppose the bend. The deltoid isn’t the primary muscle for the elbow; it mainly acts at the shoulder, not the elbow. So this action requires the biceps to contract while the triceps relaxes.

Bending the elbow (elbow flexion) happens when the biceps brachii contracts to pull the forearm up toward the upper arm. For this movement to occur smoothly, the opposing muscle—the triceps brachii—must relax so it doesn’t oppose the bend. The deltoid isn’t the primary muscle for the elbow; it mainly acts at the shoulder, not the elbow. So this action requires the biceps to contract while the triceps relaxes.

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