NEET Solved Paper 2017 Question 85
Question: Out of ‘X’ pairs of ribs in humans only ‘Y’ pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation:
Options:
A) X = 24, Y = 12 True ribs are dorsally attached to vertebral column but are free on ventral side
B) X = 12, Y = 7 True ribs are attached dorsally to vertebral column and ventrally to the sternum
C) X = 12, Y = 5 True ribs are attached dorsally to vertebral column and sternum on the two ends
D) X = 24, Y = 7 True ribs are dorsally attached to vertebral column but are free on ventral side
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Answer:
Correct Answer: B
Solution:
- Humans have 12 pairs of ribs (X = 12). Out of these, the first 7 pairs are known as true ribs (Y = 7) because they are directly attached to the sternum (breastbone) via costal cartilages. The remaining ribs are either false ribs or floating ribs. False ribs (the 8th, 9th, and 10th pairs) are indirectly attached to the sternum, while floating ribs (the 11th and 12th pairs) are not attached to the sternum at all.
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