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.
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a
X = 12, Y = 5 ---True ribs are attached dorsally to vertebral column and sternum on the two ends.
b
X = 24, Y = 2 ---The 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 vertberal column but are free on ventral side.
d
X = 12,Y = 7----True ribs are attached dorsally to vertebral column and ventrally to the sternum.
answer is D.
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Detailed Solution
X= 12, Y= 7; True ribs are attached dorsally to vertebral column and ventrally to the sternum.