CELL PROCESSES

Anexos:

• CELL PROCESSES

1. IS THE MAINTENANCE OF A CONSTANT INTERNAL STATE IN A CHANGING ENVIRONMENT.
   1. Balance in organisms
      1. In unicellular organisms the cell membrane and other parts of the cell regulate what goes materials get in and outside the cell, while in multicellular organisms have a system that transport materials to cell from other place in the organism.
   2. How do cells exchange materials?
      1. Passive Transport: the movement of particles across a cell membrane without the use of energy by the cell is called PassiveTransport.
         1. DIFFUSION
            1. OSMOSIS
      2. Active Transport: is the movement of particles agains a concentration gradient and requieres to use cell energy.
         1. ENDOCYTOSIS AND EXOCYTOSIS
   3. HOW DO ORGANISMS MAINTAIN HOMEOSTASIS: In multicellular organisms, the cells must work together to maintain homeostasis for the entire organism. Some animals adapt their behavior to control body temperature, some trees lose all their leaves around the same time each year..