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Please choose the option from Column I and Column II that correctly represents the values of 'X' and 'Y' and provides an explanation for their meaning, considering the statement: "Out of 'X' pairs of ribs in humans, only 'Y' pairs are true ribs."
Option: 1
| Column I | Column II |
| X=12,Y=5 | The dorsal attachment of true ribs is to the vertebral column, while their ventral attachment is to the sternum on both ends. |
Option: 2
| Column I | Column II |
| X=24,Y=12 | True ribs are dorsally connected to the vertebral column but have no attachment on the ventral side. |
Option: 3
| Column I | Column II |
| X=24,Y=12 | True ribs are attached to the vertebral column dorsally but remain free on the ventral side. |
Option: 4
| Column I | Column II |
| X=12,Y=7 | The attachment of true ribs is dorsal to the vertebral column and ventral to the sternum. |
Answers (1)
The correct option is (4) X = 7, Y = 12. This means that humans have a total of 7 pairs of true ribs, which are directly attached to the sternum via their own costal cartilage. True ribs are the first 7 pairs, while the remaining 5 pairs are false ribs. False ribs do not directly attach to the sternum and may either connect to the sternum indirectly or remain unattached. Hence, the correct answer is option 4.
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