The brain is the major part of central nervous system and is well protected in the cranium of skull. Each area of our brain has a specific job and no area can work alone as it works in coordination. The weight of our brain is about 3 pounds and its size about the size of ...

At the time of birth our skeletal system is made up of two kinds of tissues. One of these is bone. At this time our bone are made up of cartilage which is a tissue. The tip of our nose and stiff part of ears are made of cartilage. As we grow cartilage is replaced ...