Topic: Skeletal system, joints and disorders· Human Physiology

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 :

1. \(X=12, Y=5\) True ribs are attached dorsally to vertebral column and sternum on the two ends.

2. \(X=24, Y=7\) True ribs are dorsally attached to vertebral column but are free on ventral side.

3. \(X=24, Y=12\) True ribs are dorsally attached to vertebral column but are free on ventral side.

4. \(X=12, Y=7\) True ribs are attached dorsally to vertebral column and ventrally to the sternum.

Doubtly Asked 30 Oct 2026 NEET UG 2017 Practice test neet Save WhatsApp Report

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Answer: 4. \(X=12, Y=7\) True ribs are attached dorsally to vertebral column and ventrally to the sternum.

Key idea: Humans have 12 pairs of ribs; each rib is attached dorsally to a thoracic vertebra.

The first 7 pairs are true ribs, attached ventrally to the sternum by hyaline cartilage. Pairs 8, 9, 10 are vertebrochondral (false), and 11, 12 are floating. So \(X=12\), \(Y=7\), with dorsal attachment to the vertebral column and ventral attachment to the sternum. Answer: (4).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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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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