All living cells are characterized by irritability – the ability to respond to the action of stimuli (light, temperature, mechanical and chemical influences). Some cells (for example, nerve cells) can transition from a state of rest to a state of excitation or inhibition. The ability of cells to excitement – a specific reaction, expressed in the rapid change in the electric charge of the plasma membrane, is called excitability. In addition to excitability and conduction, muscle fibers are characterized by contractility. Thanks to her, they change their shape and size and thus perform a motor function. Cells are also characterized by processes of growth and division.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.