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:

• A. X = 12, Y = 5, True ribs are attached dorsally to vertebral column and sternum on the two ends
• B. X = 24, Y = 7, True ribs are dorsally attached to vertebral column but are free on ventral side
• C. X = 24, Y = 12, True ribs are dorsally attached to the vertebral column but are free on the ventral side.
• D. X = 12, Y = 7, True ribs are attached dorsally to vertebral column and ventrally to the sternum

Answer 1

The correct option is D X = 12, Y = 7, True ribs are attached dorsally to vertebral column and ventrally to the sternum

There are 24 ribs (12 pairs) in the human body. The first seven pairs are attached directly to the sternum by costal cartilages and are called true ribs. So Out of '12' pairs of ribs in humans, only '7' pairs are true ribs. And the correct option is X = 12, Y = 7, True ribs are attached dorsally to vertebral column and ventrally to the sternum