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NCERT Solution for Class 3-Organ Systems of Our Body Organ Systems of Our Body Our body is formed of an over sized range of Cells. Group of cells is called Tissues. Different types of tissues join to form organs or body parts. Our body has five sense organs and many other organs. These organs work in groups. A group of organs working together known as an organ system, do one major work for the body. An Organ System consists of a group of organs that work together to do the same work. These organ systems work together in our body for it to function properly. Some of the large internal organs are our body are heart, lungs, stomach, and kidneys. The Skeletal System, Digestive System, Excretory System, Respiratory System, Circulatory System, and Reproduction System are major organ systems of the body. Let’s discuss one by one: Skeletal System Digestive system Respiratory System Circulatory System Excretory System Nervous System Read More ...........> The  CBSE