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Cardio-Respiratory Control in Vertebrates - Comparative and Evolutionary Aspects (Paperback)
Loot Price: R5,781
Discovery Miles 57 810
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Cardio-Respiratory Control in Vertebrates - Comparative and Evolutionary Aspects (Paperback)
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Hopefully, this book will be taken off of the shelf frequently to
be studied carefully over many years. More than 40 researchers were
involved in this project, which examines respiration, circulation,
and metabolism from ?sh to the land vertebrates, including human
beings. A breathable and stable atmosphere ?rst appeared about 500
million years ago. Oxygen levels are not stable in aquatic
environments and exclusively water-breathing ?sh must still cope
with the ever-changing levels of O 2 and with large temperature
changes. This is re?ected in their sophisticated count- current
systems, with high O extraction and internal and external O
receptors. 2 2 The conquest for the terrestrial environment took
place in the late Devonian period (355-359 million years ago), and
recent discoveries portray the gradual transitional evolution of
land vertebrates. The oxygen-rich and relatively stable atmospheric
conditionsimpliedthatoxygen-sensingmechanismswererelativelysimpleandl-
gain compared with acid-base regulation. Recently, physiology has
expanded into related ?elds such as biochemistry, molecular
biology, morphology and anatomy. In the light of the work in these
?elds, the introduction of DNA-based cladograms, which can be used
to evaluate the likelihood of land vertebrates and lung?sh as a
sister group, could explain why their cardio-respiratory control
systems are similar. The diffusing capacity of a duck lung is 40
times higher than that of a toad or lung?sh. Certainly, some
animals have evolved to rich high-performance levels.
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