Final answer:
The top seven pairs of ribs are called true ribs, directly attached to the backbone and the breastbone, and are known as a) Ribs.
Step-by-step explanation:
a) Ribs. The top seven pairs of ribs in the human body are known as true ribs, and they are directly attached to the backbone (thoracic vertebrae) and the breastbone (sternum). The human rib cage is designed to protect vital organs such as the heart and lungs and is composed of 12 pairs of ribs in total.
True ribs make up the first seven pairs and are directly connected to the sternum via their costal cartilage. The next three pairs (false ribs) are connected to the ribs above them, while the last two pairs (floating ribs) are not connected to the sternum at all.
The next three pairs of ribs are called false ribs, and they are connected to the ribs above them by cartilage. The lowest two pairs of ribs are called floating ribs, and they are attached to muscles in the abdominal wall.