INTRODUCING THE DYNAMIC HUMAN BODY
Life is perhaps the most mysterious dynamic and marvellous existence in the universe one can see the life in different stages ranging from the unicellular amoeba to the highest evolved creature the human being the complexity of the organization of the organism progressively increases form unicellular multicellular and multilayered animal to worms and then form worms to vertebrates and finally the human being although the human body has the most complex organisation fundamentally the cell remains the functional unit of life
Tissues the human body as a whole is built of billions and trillions of cell an aggregation or group of cells having similar origin structure and function forms the tissue there are four primary types of the tissues
1.Epithelial 2. connective 3. muscular and 4. nervous.
organ different tissues combined together to perform particular function or functions is called an organ for example stomach is composed of epithelial muscular and connective tissues each has its own function the epithelial system covers the muscular system performs movements and the connective tissues connect and supports them
organ system various organs working in co ordination for the particular functions form an organ system various organ system are the osseous (skeleton)articular muscular digestive circulatory respiratory nervous excretory reproductive and endocrine system their names are suggestive of their respective functions.
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