Sejtkészlet

Sejtkészlet refers to the total number of cells within a biological organism or a specific tissue. This quantity is dynamic and can change throughout an organism's life due to processes like cell division (mitosis and meiosis), cell death (apoptosis), and cellular differentiation. The concept of sejtkészlet is fundamental to understanding growth, development, tissue maintenance, and the impact of various diseases.

The sejtkészlet can vary significantly between different species and even between different cell types within the same organism. For instance, rapidly dividing cells like those in the skin or gut lining have a much higher turnover and a larger, more dynamic sejtkészlet compared to long-lived cells like neurons. The maintenance of a stable and functional sejtkészlet is crucial for health. Disruptions, such as uncontrolled cell proliferation leading to tumors or excessive cell loss in degenerative conditions, highlight the importance of this cellular reserve. Research into stem cells and regenerative medicine often focuses on manipulating or replenishing the sejtkészlet to treat injuries and diseases. Understanding the factors that regulate sejtkészlet, including genetic and environmental influences, is a key area of biological study.