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Cells are the basic units that make up the human body

Cells are the basic units that make up the human body

Cells: We all start with a fertilized egg cell. After constant cell division, we change from 1 cell to 2, 2 cells divide into 4 cells, 4 cells divide into 8 cells, and so on again and again in a repeated occurrence. 
    That is from
    1→2→4→6→8→16→32 …
    until adult. 
There are about 30-50 trillion cells in our bodies.
Tissue: So many cells. Those with similar structure and function will be combined together to perform specific tasks together. This structure is called tissue. Such as body tissue and nerve tissue.
Organs: Composed of two or more tissues. Structures that jointly perform specific tasks, such as the heart, lungs, liver, and stomach.
System: A structure where some organs are gathered together to perform a fixed task such as the respiratory system, digestive system, urinary system.

The above is the structure of our body. Cells can belong to different tissues, organs or systems. But they still need to coordinate, integrate and cooperate with each other to complete the physiological functions required by humans to maintain human survival. When cells are abnormally diseased, people’s symptoms will be according to the illness.