The question asks about the number of ribs present in the human body, particularly focusing on the options provided. Here is the breakdown of the facts regarding the human ribcage:
In an adult human, the rib cage, also known as the thoracic cage, typically consists of 12 pairs of ribs. Each pair is symmetrically placed on either side of the body.
This means there are a total of \(12 \times 2 = 24\) ribs. Therefore, the correct answer is 24 ribs.
Rib cage structure:
The first seven pairs are known as "true ribs" and are directly attached to the sternum through costal cartilages.
The next three pairs are called "false ribs" and are indirectly attached to the sternum.
The last two pairs are known as "floating ribs," as they do not have any anterior attachment to the sternum.
The options provided were:
20
22
24
28
Only 24 matches the standard number of ribs in the human body. Other numbers do not correspond to the normal anatomical count.
This information is derived from general anatomical knowledge of the human rib structure, which is consistent across most standard educational biology texts.
