The most efficient form of respiration is aerobic respiration: this requires oxygen. When oxygen is not available, some organisms can respire anaerobically i.e. without air or oxygen

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Tissue Respiration.

Tissue respiration is the release of energy, usually from glucose, in the tissues of all animals, green plants, fungi and bacteria. All these living things require energy for other processes such as growth, movement, sensitivity, and reproduction.

The most efficient form of respiration is aerobic respiration: this requires oxygen. When oxygen is not available, some organisms can respire anaerobically i.e. without air or oxygen. Yeast can respire in both ways. Yeast gets more energy from aerobic respiration, but when it runs out of oxygen it does not die. It can continue to respire anaerobically, but it does not get so much energy from the sugar. Yeast produces ethanol (alcohol) when it respires an aerobically and ultimately the ethanol will kill the yeast. Once the yeast is killed it will be unable to respire again and therefore unable to reproduce itself.

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We can respire in both ways too. Normally we use oxygen, but when we are running in a race, we may not get enough oxygen into our blood, so our muscles start to respire anaerobically. Unlike yeast we produce lactic acid. Of course if we produced alcohol in our muscles it would make us drunk.  Which of course is not a good thing.

Glucose + Oxygen = Carbon Dioxide + Water + Energy

This word equation means: "sugar and oxygen are turned into carbon dioxide and water releasing energy".

Glucose = Carbon Dioxide + Ethanol + Energy

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