Meaning: An unpleasant or disastrous destiny. Classified under: Nouns denoting natural events. Synonyms: doom; day of reckoning; doomsday; end of the world. Context examples: everyone was aware of the approaching doom but was helpless to avoid it / that's unfortunate but it isn't the end of the world. Hypernyms (doom is a kind of...):
P874 The respiratory system contributes to homeostasis by providing for the exchange of gases - oxygen and carbon dioxide - between the atmospheric air, blood, and tissue cells. It also helps adjust the pH of body fluids. The cardiovascular and respiratory systems cooperate to supply oxygen and eliminate carbon dioxide. The respiratory system provides for gas exchange - intake of oxygen and elimination of carbon dioxide -and the cardiovascular system transport blood containing the gases between the lungs and body cells.
The heart pumps blood into the lungs where the blood is oxygenated. The blood is then returned to the heart and the newly oxygenated blood is circulated to the rest of the body. The respiratory system performs a process known as gas exchange that releases carbon dioxide from the body and brings in oxygen.he first destination of blood after it leaves the heart is to the lungs, while the respiratory system brings oxygen molecules into the body and to the lungs.