Human brain weighs about ____ kg.

Where does the process of digestion starts?

Which is the end part of gastro intestinal tract?

Name the artery which carries deoxygenated blood?

The heart, blood and blood vessels constitute the__________ system.

Intestines includes the ____________ system.

Energy for the body growth is obtained from

Which organ secretes bile?

Which is called the pacemaker of heart?

There are  _______organ systems in our body.