What is Rib cage and skull Definition?

Rib Cage

If we take a deep breath, hold it for a while and move our hand on the chest, we will find a number of bones in the chest region. These chest bones are called ribs. Ribs are the curved bones in our chest (see Figure 4). Ribs exist in pairs. There are 12 pairs of ribs in the chest of our body. We know that there is a long backbone at the back of our body. There is also a small bone called breast bone in the chest region, in front of our body (see Figure 4). One end of all the ribs is joined to the backbone and their other end is joined to the breast bone. In this way, all the rib bones, -Eye soo a part of backbone, and the breast bone, join to form a 'bony cage" or box-like structure'. The hollow, bony structure formed by the ribs is called 'rib cage' (see Figure 4). Some of the important internal organs of our body such as heart, lungs and liver lie inside the strong, bony rib cage. The rib cage protects the delicate internal organs like heart, lungs and liver. The rib cage also takes part in our breathing movements. We will study this in detail in higher classes. From the above discussion we conclude that the main functions of the rib cage are the following:

(1) Rib cage protects the internal organs of the body such as heart, lungs and liver. 2. Rib cage takes part in our breathing movements.

Skull

The bony part of our head is called skull (see Figure 2). It is called 'khopri or 'kapal' in Hindi. The skull is made of 22 bony plates joined together. Our brain is inside the skull in its upper part. The brain is made of soft tissue which could be easily damaged without a hard covering. The bones of skull form a strong case around the brain. In this way, skull protects the brain. The lower part of skull contains the face bones (including nose bone). Our face has sense organs such as eyes, ears and nose. The skull also protects the main sense organs like eyes, ears and nose. The eyes are contained in two large cavities called 'eye sockets' in front of the skull (see Figure 2). From this discussion we conclude that some of the main functions of the skull are as follows:

(i) Skull protects the brain.

(ii) Skull protects the sense organs of the face (like eyes, ears and nose). (iii) Skull gives shape to our head.

What are life process?

WHAT ARE LIFE PROCESSES? The maintenance functions of living organisms must go on even when they are not doing anything particular. Even when we are just sitting in class even if we are just asleep, this maintenance job has to go on The processes which together perform this maintenance job an We processes . Since these maintenance processes are needed to prevent damage and break-down energy is needed for them. This energy comes from outside the body of the mdhadual organism. So there must be a process to transfer a source of energy from outside the body of the organism which we call food, to the inside, a process we commonly call nutrition If the body size of the organisins is to grow, additional raw material wit also be needed from outside. Since life on earth depends on carbon- based molecules most of these food sources are also carbon-based Depending on the complexity of these carbon sources, different organisms can then use different kinds of nutritional processes The outside sourc...

Nutrition in human being?

Nutrition in Human Beings The alimentary canal is basically a long tube extending from the mouth to the anus. we can see that the tube has different parts. Various regions are specialised to perform different functions. What happens to the food once it enters our body? We shall discuss this process here. We eat various types of food which has to pass through the same digestive tract, Naturally the food has to be processed to generate particles which are small and of the same texture. This is achieved by crushing the food with our teeth, Since the lining of the canal is soft, the food is also wetted to make its passage smooth. When we eat something we like, our mouth waters. This is actually not only water..but a fluid called saliva secreted by the salivary glands. Another aspect of the food we ingest is its complex nature. If it is to be absorbed from the alimentary canal, it has to be broken into smaller molecules. This is done with the help of biological catalysts called enzyme...

Adaptation in lion & adaptation in deer

A large area of land covered mainly with trees and plants is called alaust And a large area of grass covered land used for grazing is called grassland There are few trees or places for animals to hide gland habitats. Due to this speal is important for the animals which live in grassland habitats (so they can nits away from their enemies) For most common purposes, however, the wrous forest and and are used in the same sense. The forest (or grassland) is a habitat Many animals such as lon som elephants deer, en live in forest habitats. There are many features of a lion, a deck, other animals and plant which help them to survive in the forest habitat. The adaptations in lion and deer to the forest habitat are described below. Adaptation of lion The lion is a camivorous animal which eats only the meat (or flesh) of oder animals. The lion lives in a forest habitat The adapted to the forest habitat in the following ways: 1.The lion is a strong, fast and agile animal which can hunt and ...

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