In humans and other vertebrates, there are certain processes which are considered critical for sustaining life. These include respiration, nutrition, digestion, excretion, reproduction and metabolism.
Respiration is one of the important life processes required for sustaining life. It involves the production of energy through the intake of oxygen and the release of CO2. Nutrition is another life process that is concerned with obtaining food for growth and repair. Digestion is concerned with processing and extracting the nutrients from the consumed food. Excretion is a life process that is concerned with expelling undigested and toxic end products from the body. Reproduction is the most important life process as it is concerned with the continuation of species. Metabolism is another type of life process concerned with various chemical processes important for life.
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