Which term is a large chest muscle responsible for moving the arm forward?

Which term is a large chest muscle responsible for moving the arm forward?

• A. Pectoralis major
• B. Deltoid
• C. Rectus abdominus
• D. Quadriceps femoris

Answer: (A)

Understanding which muscle moves the arm forward at the shoulder helps you connect function to location. The large chest muscle that does this is the pectoralis major. It sits across the front of the chest and attaches to the upper arm bone, so when it contracts it pulls the arm forward (flexion) and toward the body's midline (adduction). It’s the primary muscle players when you reach forward or push something away. The deltoid sits on the shoulder and mainly lifts the arm up and away from the body (abduction), while the rectus abdominis is in the abdomen and the quadriceps femoris is in the thigh, not involved in moving the arm forward.

Understanding which muscle moves the arm forward at the shoulder helps you connect function to location. The large chest muscle that does this is the pectoralis major. It sits across the front of the chest and attaches to the upper arm bone, so when it contracts it pulls the arm forward (flexion) and toward the body's midline (adduction). It’s the primary muscle players when you reach forward or push something away. The deltoid sits on the shoulder and mainly lifts the arm up and away from the body (abduction), while the rectus abdominis is in the abdomen and the quadriceps femoris is in the thigh, not involved in moving the arm forward.