Nutrition function

The nutrition is the set of processes by which the body gets different substances necessary for life, providing energy and necessary elements for structures and proper functioning of the body.

The processes involved in nutrition are:

• Digestion. The digestive system is responsible for introducing food into the body, and transforming it into simple nutrients that can be used by cells.
• Breathing. The respiratory system is responsible for obtaining the oxygen necessary for the cells and eliminating CO2 from cellular metabolism.
• Circulation. The circulatory system carries nutrients, gases, waste products and other substances, linking all the cells of the body together.
• Excretion. The excretory system eliminates waste products from cellular metabolism, transported by the circulatory system, filtering the blood and expelling them through the urine.

The biology studies all living beings and the functioning of living systems.

It is based on two fundamental concepts:

The biological systems are made up of cells, which are the basic unit of life. All living organisms are made up of one or more cells (the exceptions are viruses, which are not considered alive).

Cellular metabolism consists of a set of chemical reactions that maintain life in the cell.

Most biological processes occur within a system, which is a set of organs that work together for a specific purpose. It is important to know the different functions of each organ and its relationship with the others. Some examples of body systems are:

• The digestive system, responsible for introducing food into the body and transforming it into simple nutrients that can be used by cells
• The respiratory system, responsible for obtaining the oxygen necessary for the cells and eliminating CO2 from cellular metabolism
• The circulatory system, which carries nutrients, gases, waste products and other substances to link all the cells of the body together
• The excretory system, responsible for eliminating waste products from cellular metabolism

The relationship is the set of processes by which living beings are related to the environment that surrounds them, allowing the exchange of substances, gases and heat.