Arkansas Esthetician Practice Exam

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What is the primary muscle of the front of the upper arm that raises the arm and turns the palm of the hand down?

Tricep
Deltoid
Bicep
Veins

The correct answer is: Bicep

The primary muscle located at the front of the upper arm is indeed the bicep. Its main functions include raising the arm and facilitating the rotation of the palm downward, which is referred to as pronation. The bicep is also crucial for flexing the elbow, allowing for movements that require lifting or pulling. The tricep, on the other hand, is positioned at the back of the upper arm and primarily works to extend the elbow. The deltoid is responsible for lifting the arm and giving the shoulder its rounded shape, but it does not specifically turn the palm down. Lastly, veins are part of the circulatory system, not muscles, and do not function in arm movement. Therefore, the bicep's role in performing these actions makes it the correct answer.