Cells are the smallest units that have all the characteristics of
life. Our body cells perform several important functions:
1.Cell metabolism and energy
use. The chemical reactions that occur within cells are collectively called
cell metabolism. Energy released during metabolism is used for cell activities,
such as the synthesis of new molecules, muscle contraction, and heat
production, which helps maintain body temperature.
2.Synthesis of molecules.
Cells synthesize various types of molecules, including proteins, nucleic acids,
and lipids. The different cells of the body do not all produce the same
molecules. Therefore, the structural and functional characteristics of cells
are determined by the types of molecules they produce.
produce and receive chemical and electrical signals that allow them to
communicate with one another. For example, nerve cells communicate with one
another and with muscle cells, causing muscle cells to contract.
inheritance. Each cell contains a copy of the genetic information of the
individual. Specialized cells (sperm cells and oocytes) transmit that genetic
information to the next generation.