A)
1
2
3
4
Tibia
Fibula
Radius
Ulna
B)
Radius
Ulna
Tibia
Fibula
C)
Ulna
Radius
Tibia
Fibula
D)
Fibula
Tibia
Radius
Ulna
Correct Answer: B
Solution :
[b] In the given figure of human skeletal system, the marked bones (1, 2, 3 and 4) are identified as radius, ulna, tibia and fibula respectively. Radius and ulna are two large bones of the forearm. Radius is a long bone, prism- shaped and slightly curved longitudinally. It articulates with the capitulum of the humerus, and with the ulna at two points: the radial notch (lower) and the head (upper part) of the ulna. Ulna runs parallel to the radius, which is shorter and smaller. The tibia and fibula are two bones of hind limbs. Tibia, also known as the shin bone, is the larger and stronger of the two lower leg bones. It forms the knee joint with the femur and the ankle joint with the fibula and tarsus. The support and movement of the tibia is essential to many activities performed by the legs, including standing, walking, running, jumping and supporting the body's weight. Fibula or calf bone is located on the lateral side of the tibia, with which it is connected above and below. It is shorter, thinner and slender.
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