Respiration

thumb|upright=1.4|Real-time magnetic resonance imaging of the human thorax during breathing thumb|upright=1.4|X-ray video of a female American alligator while breathing Breathing (respiration or ventilation) is the rhythmic process of moving air into (inhalation) and out of (exhalation) the lungs to enable gas exchange with the internal environment, primarily to remove carbon dioxide and take in oxygen.

most common type of blood cell

movement of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction

thumb|upright=1.35|A group practising Nadi Shodhana pranayama (alternate nostril breathing) on the [[International Day of Yoga in Kolkata, India, in 2017 ]]

air kept under a pressure that is greater than atmospheric pressure

intentional restriction of oxygen to the brain for sexual arousal

thumb|Diagram showing inhalation Inhalation (or inspiration) happens when air or other gases enter the lungs.

thumb|Diagram showing expiration Exhalation (or expiration) is the flow of the breath out of an organism. In animals, it is the movement of air from the lungs out of the airways, to the external environment during breathing. This happens due to elastic properties of the lungs, as well as the internal intercostal muscles which lower the rib cage and decrease thoracic volume. As the thoracic diaphragm relaxes during exhalation it causes the tissue it has depressed to rise superiorly and put pressure on the lungs to expel the air. During forced exhalation, as when blowing out a candle, expiratory

form of respiration in which a normally air-breathing organism breathes an oxygen-rich liquid (such as a perfluorocarbon), rather than breathing air

gas exchange across the skin of an organism

political slogan of the Black Lives Matter movement

muscles involved in breathing

form of breathing done by contracting the diaphragm

small cluster of chemoreceptors and supporting cells located near the fork (bifurcation) of the carotid artery (which runs along both sides of the throat).

alternative physical therapy

artificial ventilation using exhaled air from the rescuer

volume of air displaced between normal inhalation and exhalation

medical condition involving hyperventilating

adhesive bandage applied across the bridge of the nose and sides of the nostrils, to assist in keeping the airway open

tests done on exhaled air

organs involved in the production of blood

Ujjayi (, IAST ujjāyī, "victorious" or "conquering") is a pranayama (breathing technique) practised simultaneously with asanas in modern yoga as exercise. It is practised especially in Pattabhi Jois's Ashtanga (vinyasa) yoga, where it accompanies vigorous asana flow exercise. It is described as a seated practice in B. K. S. Iyengar's 1966 book Light on Yoga.

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a sheet of smooth muscle in the trachea

one of several small clusters of peripheral chemoreceptors known as glomus cells, baroreceptors, and supporting cells located along the aortic arch

A respirometer is a device used to measure the rate of respiration of a living organism by measuring its rate of exchange of oxygen and/or carbon dioxide. They allow investigation into how factors such as age, or chemicals affect the rate of respiration. Respirometers are designed to measure respiration either on the level of a whole animal or plant or on the cellular level. These fields are covered by whole animal and cellular (or mitochondrial) respirometry, respectively.

medical condition

movement that makes breathing difficult

The ratio between the amount of carbon dioxide produced in metabolism and oxygen used

A sniffle is the instinctive action of inhaling quickly in order to prevent mucus from flowing from one's nasal cavity, as an alternative to blowing the nose.

process whereby an aquatic animal obtains oxygen from water