Question

Find the odd one out
A. Femur, radius, tibia, fibula and tarsals
B. Humerus, ulna, metatarsals and phalanges
C. Skull, vertebrae, sternum and pelvic girdle
D. Hinge joint, ball and socket joint and sutures
E. Humerus, femur, radius, tibia and teeth

Answer 1

The skeletal system is made up of several bones and cartilages. They provide a framework for our body. It consists of both the axial skeleton and appendicular skeleton.

Step by step answer: The bones and cartilages together provide structural support for our body. Cartilages provide support to organs like the larynx, nose, ear, etc. We can classify our skeletal system into an axial and appendicular skeleton.
-Axial skeleton comprises bones that are present in the skull, vertebral column, sternum, and ribs. They are the bones present in the longitudinal axis of the body. Skull bones include cranial bones, facial bones and ear ossicles. Cranial bones are frontal, occipital, temporals, parietals, sphenoid and ethmoid. A Vertical column is made up of a series of bones called vertebrae. Cartilaginous disks are seen between two vertebrae and are called intervertebral discs. The Vertical column protects the spinal cord. The sternum is the flat bone seen in the middle of the chest. Ribs are curved bones and articulate with the sternum and vertebral column.
-The appendicular skeleton is made up of bones from limbs. Forelimb bones include humerus, radius, ulna, carpals, metacarpals, and phalanges. Hind limb is made up of femur, patella, tibia, fibula, tarsals, metatarsals, and phalanges. Also, girdle bones are included in the appendicular skeleton.
-Teeth are different from bones. They are seen in the oral cavity and help us in chewing. They are primarily made up of calcium salts and contain a hard substance called enamel that helps for chewing.
Hence, the correct option is E.

Note: The bones and cartilages are actually specialised connective tissues. They differ in their matrix as the bones have a hard matrix while cartilages have a type of flexible matrix. The bones primarily contain calcium salts while cartilages contain chondroitin salts.