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GROWTH AT DIFFERENT LEVELS -
1. Molecular level - It involves synthesis of new molecules and their aggregation into organellae.
2. Cellular level - It includes -
(i) Expansion or hypertrophy - Increases in the size of cell due to addition of protoplasm.
(ii) Cell division (Hyper plasin) - Increase in the number of cells.
(iii) Cell differentiation - formation of tissue and organs.
(iv) Matrix formation - addition of apoplasmatic substance as matrix of connective tissue, inercellular fluid.
3. Individual level - Visible increase in body dimension.
The cell cycle undergoes a sequence of changes which involve a period of growth replication of DNA, Followed by cell division. This sequence of changes is called cell cycle.
Internal structure of the heart of man Internally there are four chambers in the heart. The upper two chambers are called auricles and the lower two chambers are called vent
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