Question

The given diagram shows a human skeleton. Which of the following correctly identifies the bones marked as 1, 2, 3 & 4?

	1.	2.	3.	4.
A)	Tibia	Fibula	Radius	Ulna
B)	Radius	Ulna	Tibia	Fibula
C)	Ulna	Radius	Tibia	Fibula
D)	Fibula	Tibia	Radius	Ulna

Answer 1

Hint:
The bones of the limbs along with their girdles constitute the appendicular skeleton. Each limb is made of 30 bones. The bones of the hand or forelimb are the humerus, radius, ulna, carpals (wrist bones 8 in number), metacarpals (palm bones 5 in number), and phalanges (digits 14 in number)

Complete step by step answer:
The above figure shows a human skeletal system. Labelled part 1) shows radius, part2) shows ulna, part 3) shows tibia, and part 4) shows fibula. The two large bones of the hands are the radius and ulna. A radius is a bone that is shaped as a prism, is a long bone, and is also somewhat curved to the longitude side. It connects with the capitulum of the humerus. It also connects with the ulna by 2 ends: the lower part and the upper part also known as the head. The radius and ulna are parallel to each other and the ulna is shorter and smaller than the radius.
Hind limbs constitute the tibia and fibula. Tibia’s other name is shin bone. This bone is the strongest and largest of both of these. The tibia helps in the formation of the knee joint with the femur and ankle joint with the fibula and tarsus. Activities like standing, walking, running, jumping, and supporting body weight are done due to movement and support of the tibia. The fibula is also called the calf bone. On the lateral side of the tibia, the fibula is located. It is short, thin, and more slender than the tibia.

Option ‘B’ is correct

Note:
Femur (thigh bone is the longest bone, tibia and fibula, tarsals (ankle bones 7 in number), metatarsals (5 in number), and phalanges (digits 14 in number) are the bones of the leg and they are also called hind limbs.