AIIMS 2006 Zoology Skeletal System MCQ Question

To answer the question regarding which group of bones contributes directly to the movement of a cricket player chasing a ball, we need to analyze the role of each bone group in the context of human locomotion.

Correct Answer: D) tarsals, femur, metatarsals, tibia

Explanation of the Correct Answer:

1. Tarsals: These bones are located in the ankle and play a crucial role in movement and stability during running. They allow for flexibility and help in weight-bearing as the player accelerates to chase the ball.
2. Femur: This is the thigh bone and the largest bone in the human body. It is essential for any leg movement, providing the primary leverage and strength needed for running and jumping.
3. Metatarsals: These are the long bones in the foot that connect the tarsals to the toes. They are involved in the push-off phase of running, helping the player to propel forward.
4. Tibia: Also known as the shin bone, the tibia is one of the two bones in the lower leg and is vital for bearing weight and facilitating movement. It transmits forces generated by the femur to the foot.

Together, these bones form a functional unit that supports the mechanics of running, allowing for efficient and powerful movement.

Why Other Options are Incorrect:

A) femur, malleus, tibia, metatarsals

• Malleus: This is an ear bone involved in hearing, not in locomotion. Its presence in this group makes it irrelevant to the movement of the player.

B) pelvis, ulna, patella, tarsals

• Ulna: This is one of the bones in the forearm and does not contribute to leg movement. While the pelvis is important for transferring forces from the legs to the torso, the ulna's inclusion makes this option incorrect.

C) sternum, femur, tibia, fibula

• Sternum: This is the breastbone and is part of the rib cage, which protects the heart and lungs. It does not have a direct role in leg movement. The fibula, while it provides some stability to the ankle, does not play a major role in propulsion compared to the other bones listed in option D.

Summary

The correct answer, D) tarsals, femur, metatarsals, tibia, includes only those bones that are directly involved in the biomechanics of running. Each of these bones contributes to the movement of the leg and foot, facilitating the swift action required for a cricket player to chase a ball effectively.

Understanding the role of various bones in movement helps in appreciating human anatomy and physiology, which is vital for students preparing for exams like NEET/JEE.