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thorax

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Thorax


Part of the body in four-limbed vertebrates containing the heart and lungs, and protected by the ribcage. It is separated from the abdomen by the diaphragm. During breathing (ventilation) the volume inside the thorax is changed. This then causes air to move in or out of the air passages that lead to the lungs. The volume of the thorax is altered by the contraction of muscles in the diaphragm and the contraction of muscles between the ribs – the intercostal muscles.

In arthropods, the thorax is the middle part of the body, between the head and abdomen. In insects the thorax bears the legs and wings. The thorax of spiders and crustaceans, such as lobsters, is fused with the head, to form the cephalothorax.

© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.


 
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adenosine triphosphate
aerobic
aerobic respiration
alveolus
anaerobic respiration
ATP
breathing
bronchiole
bronchus
carbon dioxide
cilia
diaphragm (anatomy)
diffusion
energy (biology)
epiglottis
gas exchange
glucose
intercostal
lactic acid
lung
mucus
nicotine
oxygen
oxygen debt
respiration
respiratory tract
smoking (tobacco)
thorax
trachea
ventilation
water

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