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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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Introduction

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. ...read more.

Middle

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 This word equation means: "glucose is turned into carbon dioxide and ethanol releasing energy". You must memorise this word equation. Ventilating the Lung. This is the proper term for what many people call breathing. If you open a window, you can ventilate a room and get rid of all the nasty smells of BO, cigarette smoke, and cooking; but if you open your mouth it is not enough to ventilate your lungs. ...read more.

Conclusion

Inhaled air is mixed with the stale air already in our lungs; so although the air we inhale contains 20% Oxygen, the air in our alveoli (alveolar air) only contains 14% Oxygen. Don't expect all the stale used air to come out just by opening your mouth, it must be pushed out. This happens when the diaphragm relaxes and the muscles of the abdomen (tummy) push the lungs up. The rib cage can also be pulled down and in. So this is how you exhale. Although alveolar air only contains 14% Oxygen, it gets mixed with rather fresher air in your trachea. This means that exhaled air may contain 16% Oxygen. When someone inhales and exhales as deeply as they can, about 5.5 Litres of air comes in and out. ...read more.

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