The number of ribs contact with sternum:
- a- 7
- b- 14
- c- 18
- d- 24
The correct answer is a. 7.
There are 12 pairs of ribs in humans, but not all directly connect to the sternum. Only the first 7 pairs of ribs, known as true ribs, have direct cartilage attachments to the sternum. The remaining 5 pairs, called false ribs, either connect indirectly to the sternum through the cartilage of other ribs or have no direct connection at all.
Therefore, only 7 ribs directly contact the sternum.
Other Options:
Here's a breakdown of the other options:
- b. 14:
This is incorrect because it includes all pairs of ribs, not just those that directly connect to the sternum.
- c. 18:
This is also incorrect because it significantly overestimates the number of ribs and includes false ribs that don't connect to the sternum.
- d. 24:
This is the total number of ribs in a human, but not all connect to the sternum.
Remember, the number of true ribs is a consistent anatomical feature in humans, and understanding this detail is important for various medical and biological applications.
