Q. 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 = 7 : True ribs are attached dorsally to vertebral column and ventrally to the sternum.
B) X = 12, Y = 5 : True ribs are attached dorsally to vertebral column and sternum on the two ends.
C) X = 24, Y = 7 : True ribs are dorsally attached to vertebral column but are free on ventral side.
D) X = 24, Y = 12 : True ribs are dorsally attached to vertebral column but are free on ventral side.
Explanation
[Solution] Humans have 12 pairs of ribs; the first 7 pairs (true ribs) attach dorsally to the vertebral column and ventrally to the sternum. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.