The circulation system consists mainly of the following components: the heart muscle, the blood vessels and the blood. These three parts of the blood circulation fulfill different functions but have the same overall aims: 

1. Transporting oxygen and nutrient-rich blood from certain organs of the body to all of the body’s cells.

2. Transporting carbon dioxide and waste from all body cells to organs where these can be delivered.

These organs include the lungs, the liver, the kidneys and the gastrointestinal tract. In this way, blood circulation functions as the body’s transport system. Here is 5 reasons why you need the circulatory system .


1. The cell needs fuel to burn

A cell needs to be constantly provided with a variety of substances to work. Among other things, it must get energy in the form of energy-rich compounds. In order for a cell to be able to use the energy that these compounds carry, these need to be transformed. This is often called combustion or catabolism.


2. The cell needs oxygen for the combustion

In order for energy recovery to be sufficiently efficient, the cell needs oxygen. In addition, the combustion gives rise to carbon dioxide. The circulation system must thus both transport oxygen to the cells and carbon dioxide from them. The blood then emits the carbon dioxide into the lungs, while again oxygenating. This is one of the most important functions of the circulation. The processes in the body that are responsible for oxygen and carbon dioxide being transported between the air of the atmosphere and all the cells of the body are called respiration.


3. The cell needs building blocks

In order for cells to grow, produce new substances or repair damaged parts, the body’s cells must also have access to building blocks. The building blocks of the body consist mainly of a category of chemical compounds called amino acids. Amino acids are linked together in chains and form proteins. Other substances – such as different fats – also work in the body as building blocks. The term anabolism summarizes the constructive processes in the body where the cell, with the help of building blocks, builds new substances. The building blocks come to the cells via the circulation. Catabolism and anabolism together make up the cell’s metabolism, cell metabolism.


4. Cells must be able to exchange information

The cells in the body must be able to communicate with each other. Some cells in the body produce substances that act as letters between different cells. These neurotransmitters are called hormones. Blood circulation transports hormones from the producing cells to the recipient cells. Thus, the circulatory system functions as a kind of postal service for the body’s postal items.


5. Immune cells must be able to move in the body

Blood circulation also functions as public transport for the body’s immune cells – the white blood cells. These have the function of defending the body against various types of infections but also control over repair processes in other types of injuries. In order for the white blood cells to be able to quickly accumulate in a specific location in the body, they are transported in the blood circulation. This allows the body to continuously mobilize white blood cells, for example, to a wound injury to quickly eliminate infectious bacteria or initiate a healing process. Immunoglobulins (antibodies) also circulate in the blood as an important part of the immune system. These identify and bind to foreign substances and mark these for the rest of the immune system.

In addition to all these functions, blood circulation also has other functions in the body. Examples of these are regulation of body temperature and regulation of the body’s acidity (pH value).

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