Changes

*'''Atrophy''' is a decrease in the size of the cells and respective organ(s), occurring after the organ has reached it's normal size.  

*'''Atrophy''' is a decrease in the size of the cells and respective organ(s), occurring after the organ has reached it's normal size.  

*'''Hypertrophy''' is an increase in the size of an organ due to an increase in size of the individual cells.  

*'''Hypertrophy''' is an increase in the size of an organ due to an increase in size of the individual cells.  

*'''Hypoplasia''' is a reduction in the size of cells and tissues due to a failure to grow to the normal size which ranges from mild hypoplasia to almost complete absence.  

*'''Hypoplasia''' is a reduction in the size of cells and tissues due to a failure to grow to the normal size which ranges from mild hypoplasia to almost complete absence. Almost complete absence is also called vestigial or rudimentary.  

Almost complete absence is also called vestigial or rudimentary.  

*'''Aplasia''' and '''agensis''' refer to complete absence of tissue.  

*'''Aplasia''' and '''agensis''' refer to complete absence of tissue.  

*'''Hyperplasia''' is an increase in the size of an organ due to an increase in the numbers of cells present within it.  

*'''Hyperplasia''' is an increase in the size of an organ due to an increase in the numbers of cells present within it. Hypertrophy and hyperplasia may occur concurrently.  

Hypertrophy and hyperplasia may occur concurrently.  

*'''Metaplasia''' is a transformation of one type of tissue into another and occurs solely in connective tissue and epithelium.

*'''Metaplasia''' is a transformation of one type of tissue into another and occurs solely in connective tissue and epithelium.

*'''Dysplasia''' is abnormal growth within a tissue

*'''Dysplasia''' is abnormal growth within a tissue

*'''Neoplasia''' is a serious disturbance of growth of tissues

*'''Neoplasia''' is a serious disturbance of growth of tissues

 

The final pathological process that occurs at a cellular level is [[Necrosis - Pathology|necrosis]], which is the death of cells within the living body.  

 

Necrosis means the death of cells within the living body.  

Two things happen when necrosis occurs:  

Two things happen when necrosis occurs:  

1.Further changes can take place in the tissue itself.  

#Further changes can take place in the tissue itself.  

2.The surrounding unaffected living tissue can react against this necrotic tissue. [[Necrosis - Pathology]]

#The surrounding unaffected living tissue can react to the necrotic tissue.

==Disease==

==Disease==