Question

In skeleton which group is correct?? Skull,vertebrate column rib cage & hand legs arm

Answer 1

Skull , Vertebrate column , rib cage .

Answer 2

Answer:

i) The ribcage:

Structure:

There are 12pairs of thin, flat, bones called the ribs that curve around from the spine to the front of

the body. The ribs are connected to the sternum, which is about 12–15cm long, by cartilage. The

ribcage is flexible, which is necessary during breathing.

• The first seven pairs of ribs are attached directly to the breastbone or sternum. These are

known as true ribs.

• The eighth, ninth and tenth pairs of ribs are attached to the lowest true rib. These are known as

false ribs.

• The last two pairs of ribs are not attached to the sternum or to the lowest true rib. These are

only attached to the spine. They are called floating ribs.

Function:

The ribcage protects the lungs and the heart.

(ii) The skull:

Structure:

The upper part of the skull is the cranium, which is made up of eight flat bones joined together. The

face is made of 14 bones. The lower jawbone is the only movable bone in the skull. All the other

joints are immovable.

Function:

The skull protects the brain.

(iii) The vertebral column:

Structure:

It is made of 26 irregularly shaped bones called vertebrae. The backbone is S-shaped. Each vertebra

has a hole in the middle through which the spinal cord passes. Cartilage is found between the

vertebrae.

Function:

• The backbone holds the head and body upright.

• It protects the delicate spinal cord.

• The joints in the vertebrae help us to bend and twist our back.