It is therefore no surprise that human blood and the vascular system are particularly affected by the oxygen problem in the broader sense: the job of this distribution system is to absorb, bind and transport oxygen and to release it in appropriate, well-measured amounts at the destination without greater losses or damage.

This is not just about the structural materials of living beings. It's about a lot more. About the "workings" of living things, thus the process of life itself. Living means, among other things, obtaining free energy from outside in order to guarantee growth, to reproduce and create the next generations and to repair damage.

The oxygen problem:

The oxygen problem addressed in many publications mainly results from the fact that as an element essential to life oxygen in its atmospheric form is only slightly reactive. In order to react with other biomolecules it must first be activated. However, this activation creates oxygen species that are not just reactive in the desired form, but are also aggressive and even toxic. The biological utilization of oxygen thus occurs on a path bordering the necessity of oxygen activation and the potential toxicity of the activated oxygen.

Oxygen supply from blood: oxygen transport

It is therefore no surprise that human blood and the vascular system are particularly affected by the oxygen problem in the broader sense: the job of this distribution system is to absorb, bind and transport oxygen and to release it appropriate, well-measured amounts at the destination without greater losses or damage. It should be noted that the absorption of oxygen by the organism mainly occurs via three main functions:

1. via absorption by the lungs
2. via oxygen transport in the vascular system and in the capillaries with the assistance of the hemodynamic function
3. via oxygen release in the cells where oxygen utilization takes place

Oxygen supply depends on the availability of oxygen in the lungs, from the sufficient pulmonary (affecting the lungs) exchange of gas, the blood supply to the tissue and the ability of the blood to transport oxygen. In doing so, the oxygen cascade is of great significance: this means the delivery of oxygen via the hemoglobin transport vehicle. The cascade-like functioning vascular system ensures that oxygen absorbed in the lungs is transported to the organs and tissues and the carbon dioxide formed here is returned to the lungs.

The volume of blood for an adult human is approx. 5 kg, for the most part consisting of water and roughly estimated 4,000 g of oxygen. In one kilogram of blood there are approx. 5 thousand billion erythrocytes (red blood cells) whose main function is the transport of "free oxygen" from the lungs to the tissues and the removal of combustion products, meaning carbon dioxide and water vapor from the lungs to the outside. Because oxygen consumption is highly dependent on the activity of the organism as a whole, the transport and release of oxygen is subject to a variety of regulatory processes and systems.

Circulation – microcirculation and oxygen transport:

The transport routes used to transport the absorbed oxygen with the assistance of the erythrocytes (a type of liquid drop perfectly adapted to all blood flow conditions) are the vessels – the arteries, capillaries and veins – which along with the connection to the heart form the cardiovascular system.

This is a transport system in which the pump (heart) and means of transport (blood) moves in a closed system of elastic tubes (vessels) – the circulatory system. This system's most important task is to supply all vital cells of the organism with the substances (oxygen as well as nutrients) required for their normal functioning and to remove all metabolic products from the cells, meaning carbon dioxide and other metabolites. The human circulatory system consists of two main sections connected in series. Firstly, the large body or organ circulatory system with the left ventricle as the pump and secondly, the small or pulmonary circulatory system with the right ventricle as the pump.