The
building unit of our body is cell. Again our body has an extreme fine balance
of various chemicals and compounds. A homogenous group of cells is called
tissue. Various tissues together form an organ and more than one organ make
functional systems of the body like respiratory system, circulatory system,
endocrine system, reproductive system, nervous system etc. The lungs, liver,
kidney, pancreas, stomach, intestine, etc. are examples of organ whereas blood,
skin, bone marrow etc. are tissues.
The cell i.e. building unit of body,
is made up of cytoplasm and nucleoplasm. The cytoplasm is encircled by cell
membrane. The cell membrane is a selective permeable structure meaning only
those material will pass inside and outside the cell which are essential for a
particular cell. Thus cell maintain a fine balance of chemicals and compounds
within itself.
If under any circumstances, the
selective permeability of cell is not maintained or altered or changed, the
chemical balance of cell is disturbed and it fell sick. This is initial stage
of disease development. All diseases or ailments start from the cell and when a
sizeable number of cells become sick, the tissue is affected and which
ultimately result in to sickness of organ. If the same trend continues, one or
more systems of body is affected.
It is important to note that in most
of the diseases or ailments symptoms appear either at organ or system level or
more later whereas disease initiates at cell level and proceeds unnoticed
without causing any symptom. Sometimes, as in the case of cancer, the symptom
appear in the last stage of disease development.
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