Organs are basically composed of tissues which are composed of cells.
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Tissues
Mitosis occurs to replace tissue cells. Meiosis is cell division for the production of gametes.
Almost every cell in the human body is replaced every few years through the process of cell division and renewal. This process is called cell turnover, where old or damaged cells are constantly being replaced by new cells to maintain the integrity and functionality of tissues and organs.
Yes, capillaries are the smallest blood vessels and are designed to reach every cell in the body. Their extensive network allows for the exchange of gases, nutrients, and waste products with the surrounding tissues at a cellular level.
Langerhans cell