Question

How many bones are included in the human arm?
A. 30
B. 28
C. 26
D. 20

Answer 1

Hint: The arm and hand bones support the upper limbs and provide the muscles with attachment points that move the upper limb.

Complete Answer:
- Bone is an example of a connective tissue. Bone is a representation of connective tissue. Bones have a strong and non-pliable ground material rich in calcium salts and collagen fibres, providing strength.
- It is the main tissue that gives the body a rigid structure. Bones support soft tissue and organs, and protect them. It also helps to bind the muscles.

(I) The arm consists of three large bones-humerus, radius and ulna. The humerus extends from the shoulder to the elbow. The ulna as well as the radius forms the bones of the forearm.
(II) The ulna is the longer and larger of the two bones, located on the medial side of the forearm. The radius is somewhat narrower and extends laterally from the side of the elbow towards the thumb side of the forearm, running parallel to the ulna.
(III) The hand is made up of twenty-seven bones. There are eight carpals that form the wrist joint with the ulna and radius, and the metacarpal joints as well. The supporting bones of the palm are formed by five cylindrical bones called metacarpals. Each metacarpal makes a joint with the carpals and another joint with the finger's proximal phalanx.
(IV) The phalanges are a group of 14 bones, which help and move the digits. The phalanges are long bones that form hinge joints within themselves, and form condyloid joints with the metacarpals.

Thus, there are a total of 30 bones that make up each arm.

Note: To perform various tasks such as raising objects, swimming, playing a musical instrument and writing, our arms and hands need a combination of strength and dexterity. The joints in the arm and hand allow for various types of movement while maintaining upper limb strength.