Respiration

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Respiration is the whole chain of processes from inhalation of air to the use of oxygen in the cells. It is the process that helps living beings release energy from food for life activities.

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Cellular respiration is the pathway or chain of chemical reactions by which cells release energy by breaking the chemical bonds of glucose molecules. It is an important part of respiration because it …

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Respiration is called a catabolic process because it breaks down complex food molecules into simpler substances and releases energy. In glucose breakdown, energy is released for body activities.

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Lavoisier concluded that respiration is a slow combustion process. He also related respiration to the change of respirable air into fixed air in the lungs.

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Fixed air means carbon dioxide. Respirable air or eminently respirable air means oxygen. These were historical names used in early studies of gases.

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Lime water turns milky. This happens because exhaled air contains carbon dioxide, which also makes lime water milky.

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The respiratory system usually means the passages that transport air to the lungs and to the microscopic air sacs in them called alveoli, where gases are exchanged between air sacs and blood vessels, …

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Air passes through the nostrils, nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, and finally reaches the alveoli. From the alveoli, gases are exchanged with blood.