"respiration system" is correct and usable in written English.
It refers to the process of breathing and the organs involved in it (lungs, diaphragm, etc.). You can use "respiration system" in any context when discussing the topic of breathing or the anatomy involved in breathing. For example, "The human respiration system is a complex set of organs responsible for exchanging oxygen and carbon dioxide."
What kind of respiration system could maintain a high enough level of oxygen over such a wide expanse?
The external respiration system uses the lungs and a much larger series of air sacs distributed throughout the body so that the oxygen supply communicates directly with body parts.
An N balance was completed over 7 days, and CO2, CH4, heat production and O2 consumption were measured in all pigs for 4 h using an open circuit respiration system.
Afterwards, to build a foundation for the optimization of the AOSS, the airflow dynamic characteristics of an aircraft are analyzed, and the effects of key parameters on the respiration system are researched.
I would have a dual respiration system so that we could convert our breathing from oxygen to carbon dioxide to carbon dioxide to oxygen and back again.
The air flow in the respiration system was corrected to 0°C and an atmospheric pressure of 760 mm Hg.
I've written about oxygen and respiration systems before, but tents, food rations, boots and ropes were all argued over and tested by the organisers and team members of the 1953 expedition.
It is widely used in respiration systems in mines, submarines and spacecraft as it takes less volume than the gaseous oxygen.
During glycerol-induced stress, it appears that cells may be reducing their oxygen consumption by upregulating alternative (anaerobic) respiration systems.
Some components of other alternative respiration systems, such as nirB (nitrite reductase) and ttrB (part of tetrathionate reductase), were also upregulated.
High temperature stress may scorch leaves, delay seed germination, disrupt photosynthesis and respiration systems, retard growth, damage plant organs and eventually lead to plant death (Guilioni et al. 1997; Wahid et al. 2007; Hasanuzzaman et al. 2013).
