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:
- AX = 12, Y = 7; True ribs are attached dorsally to vertebral column and ventrally to the sternum
- BX = 12, Y = 5; True ribs are attached dorsally to vertebral column and sternum on the two ends
- CX = 24, Y = 7; True ribs are dorsally attached to vertebral column but are free on ventral side
- DX = 24, Y = 12; True ribs are dorsally attached to vertebral column but are free on ventral side
Solution & Step-by-step Explanation
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Humans have 12 pairs (X) of ribs. The first 7 pairs (Y) are called true ribs because they are directly attached to the vertebral column (dorsally) and the sternum (ventrally) via hyaline cartilage.
Humans have 12 pairs (X) of ribs. The first 7 pairs (Y) are called true ribs because they are directly attached to the vertebral column (dorsally) and the sternum (ventrally) via hyaline cartilage.