Biceps and triceps muscles in the upper arm. Left: biceps contracted. Right: triceps contracted.
Calf muscles: The muscles extending from the back of the knee to the heel
The full, rounded appearance of the shoulder is due to the deltoid.
The gluteus comes powerfully into action to rise the legs (lower limbs) in walking, running, and climbing.
The pectorals are powerful muscles that extend from the front of the thorax to the arm.
The quadriceps muscle is a powerful extensor of the knee joint.
The trapezius is a large, diamond-shaped muscle that extends from the back of the skull down to the lower part of the backbone.
The frontal muscle is located in the face and allows a large variety of facial expressions.
The abdominal muscles are a wall to protect the abdomen.
Flexor muscles and extensor muscles move the wrist.
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