Question

Humans have ___ pairs of true ribs.

a. two
b. five
c. seven
d. twelve

Answer 1

Humans have 7 pairs of true ribs.

Step-by-step explanation:

True ribs, also known as vertebrosternal ribs, are a specific set of ribs in the human ribcage that directly articulate with the sternum (breastbone) via their own costal cartilages. There are typically seven pairs of true ribs in humans, numbered 1 to 7.

The thoracic cage, also known as the rib cage, consists of 12 pairs of ribs. The ribs are anchored to the 12 thoracic vertebrae and classified as true ribs (1-7) and false ribs (8-12). The true ribs are attached directly to the sternum via costal cartilage.

Answer 2

d) Twelve

Step-by-step explanation:

The vast majority of people are born with 12 pairs of ribs, for a total of 24, no matter their sex. The exception to this anatomy rule are people born with specific genetic anomalies.