Final answer:
When an adolescent bends forward, a straight spine and symmetrical posterior ribs are expected findings. However, if there are abnormalities such as abnormal curvatures or scoliosis, the spine may not be straight and the right and left sides of the back will not be level with each other in the bent position.
Step-by-step explanation:
When the adolescent bends forward, a straight spine and symmetrical posterior ribs are expected findings. If these are present, it indicates a normal posture and alignment of the spine. However, if there are abnormalities such as abnormal curvatures or scoliosis, the spine may not be straight and the right and left sides of the back will not be level with each other in the bent position. Excessive vertebral curves, including kyphosis and lordosis, can be identified by observing the vertebral profile from various angles.