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  2. Asphyxiant gas - Wikipedia

    en.wikipedia.org/wiki/Asphyxiant_gas

    An asphyxiant gas, also known as a simple asphyxiant, is a nontoxic or minimally toxic gas which reduces or displaces the normal oxygen concentration in breathing air. Breathing of oxygen-depleted air can lead to death by asphyxiation (suffocation).

  3. Argon - Wikipedia

    en.wikipedia.org/wiki/Argon

    Argon is a chemical element; it has symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. [10] Argon is the third most abundant gas in Earth's atmosphere, at 0.934% (9340 ppmv).

  4. Brain size - Wikipedia

    en.wikipedia.org/wiki/Brain_size

    The size of the brain is a frequent topic of study within the fields of anatomy, biological anthropology, animal science and evolution.Measuring brain size and cranial capacity is relevant both to humans and other animals, and can be done by weight or volume via MRI scans, by skull volume, or by neuroimaging intelligence testing.

  5. Gasotransmitter - Wikipedia

    en.wikipedia.org/wiki/Gasotransmitter

    For one gas molecule to be categorized as a gasotransmitter, all of the following criteria should be met. [4] [3] It is a small molecule of gas; It is freely permeable to membranes. As such, its effects do not rely on the cognate membrane receptors. It can have endocrine, paracrine, and autocrine effects.

  6. Nitrogen narcosis - Wikipedia

    en.wikipedia.org/wiki/Nitrogen_narcosis

    Narcosis results from breathing gases under elevated pressure, and may be classified by the principal gas involved. The noble gases, except helium and probably neon, [2] as well as nitrogen, oxygen and hydrogen cause a decrement in mental function, but their effect on psychomotor function (processes affecting the coordination of sensory or cognitive processes and motor activity) varies widely.

  7. Inert gas - Wikipedia

    en.wikipedia.org/wiki/Inert_gas

    The term inert gas is context-dependent because several of the inert gases, including nitrogen and carbon dioxide, can be made to react under certain conditions. [1] [2] Purified argon gas is the most commonly used inert gas due to its high natural abundance (78.3% N 2, 1% Ar in air) [3] and low relative cost.

  8. Noble gas - Wikipedia

    en.wikipedia.org/wiki/Noble_gas

    [13] [86] The reduced amount of dissolved gas in the body means that fewer gas bubbles form during the decrease in pressure of the ascent. Another noble gas, argon, is considered the best option for use as a drysuit inflation gas for scuba diving. [87] Helium is also used as filling gas in nuclear fuel rods for nuclear reactors. [88] Goodyear Blimp

  9. Gaseous signaling molecules - Wikipedia

    en.wikipedia.org/wiki/Gaseous_signaling_molecules

    Gaseous signaling molecules are gaseous molecules that are either synthesized internally (endogenously) in the organism, tissue or cell or are received by the organism, tissue or cell from outside (say, from the atmosphere or hydrosphere, as in the case of oxygen) and that are used to transmit chemical signals which induce certain physiological or biochemical changes in the organism, tissue or ...

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