In modern psychologyStudies and research

Physiologists divide organic functions into three categories: nutritional functions, sensory and movement functions, and then reproductive functions. The first includes the processes of digestion, blood circulation, breathing, and excretion of waste. Together, these processes lead to tissue growth and the generation of energy and heat that the animal consumes during movement. As for the functions of sense and movement, they are what establish the animal's connection with its external enviro...