![]() How often a breath is taken and how much air is inhaled or exhaled is regulated by the respiratory center in the brain in response to signals it receives about the carbon dioxide content of the blood. Carbon dioxide exits the cells, enters the bloodstream, travels back to the lungs, and is expired out of the body during exhalation.īreathing is both a voluntary and an involuntary event. There, oxygen is exchanged for carbon dioxide, which is a cellular waste material. The air contains oxygen that crosses the lung tissue, enters the bloodstream, and travels to organs and tissues. That air is doing more than just inflating and deflating the lungs in the chest cavity. With every inhalation, air fills the lungs, and with every exhalation, it rushes back out. This equates to about 900 breaths an hour or 21,600 breaths per day. Humans, when they are not exerting themselves, breathe approximately 15 times per minute on average. Wait several seconds and then let it out. Thus the circulatory and respiratory system, whose function is to obtain oxygen and discharge carbon dioxide, work in tandem. In humans, other mammals, and birds, blood absorbs oxygen and releases carbon dioxide in the lungs. Gas exchange between tissues and the blood is an essential function of the circulatory system. Pressure differences within the system cause the movement of the blood and are created by the pumping of the heart. ![]() The medium for transport of gases and other molecules is the blood, which continually circulates through the system. This extensive network supplies the cells, tissues, and organs with oxygen and nutrients, and removes carbon dioxide and waste compounds. The human circulatory system has a complex network of blood vessels that reach all parts of the body.
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