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Preksha Dhyana :
structures of the various organs of the body are built up from chemical constituents and differences in chemical composition distinguish one type from another. Cells participate in every function of the body from birih to death. Tissues, Organs and System
Groups of cells with a similar structure together with the non-living material (inter-cellular substance) between them form many types of tissues such as:
(i) Epithelial or covering tissue (ii) Bone and cartilage (iii) Muscle tissue (iv) Nerve tissue etc.
Tissues performing a common function or functions: are grouped into organs, e.g. heart is one of the vital organs of the body. Team work is an essential ingredient for survival in the living body. A 'system' is a group of organs working together to perform a series of functions.
The skeletal system, the muscular system, the skin etc. are some of these. The other important systems of the body wbich merit more detailed treatment are :
(i) Nervous system (ii) Circulatory system (iii) Respiratory system (iv) Digestive system (v) Endocrine system (vi) Urinary system.
1. Nervous System The nervous system is the most complex system in the human body. It co-ordinates and regulates the work of other systems (of the body) and through them controls the functions of the body as a whole. That is why it is considered to be the most important system of the body. Its failure will result in total cessation of its activities, paralysis of all the organs and ultimate stoppage of all vital, processes. One would be unable to use one's-museles,
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