The evolution of air-breathing respiratory faculties in invertebrates

2019 ◽  
pp. 113-124
Author(s):  
Steven F. Perry ◽  
Markus Lambertz ◽  
Anke Schmitz
Keyword(s):  
Circulatory System ◽  
Control Of Breathing ◽  
Partial Replacement ◽  
Air Breathing ◽  
Book Lungs ◽  
Similar Tendency ◽  
Air Sacs ◽  
Interesting Correlation ◽  
Respiratory Proteins

This chapter aims at piecing together the evolution of air breathing in invertebrates, the main conclusion here being that it evolved independently several times. In molluscs alone, air breathing has evolved several times, but almost exclusively among snails. Among crustaceans, several groups of crabs have also independently developed terrestrial representatives and transitional stages, particularly in the control of breathing, are evident. Analysis of insects shows few recognizable evolutionary progressions: air sacs and different stigmatal closure mechanisms have appeared and disappeared numerous times, even within closely related groups. But other tracheate groups such as myriapods show an interesting correlation between the presence of tracheal lungs, which end in an open circulatory system, and tracheae that invade the tissue as in insects, and the presence or reduction of respiratory proteins. In arachnids a similar tendency is seen, and the most interesting developments were the (partial) replacement of a ‘perfectly good’ air-breathing organ (book lungs) by another one (tracheae).

Control of breathing in craniotes

2019 ◽  
pp. 164-169
Author(s):  
Steven F. Perry ◽  
Markus Lambertz ◽  
Anke Schmitz
Keyword(s):  
Muscle Contraction ◽  
Muscle Activity ◽  
Control Of Breathing ◽  
The Other ◽  
Air Breathing ◽  
Ventilatory Frequency ◽  
Blood Ph ◽  
Other Hand

Craniote gills are arranged sequentially along the pharynx and accordingly are ventilated from anterior to posterior by a wave of muscle contraction, beginning with the mouth. Each gill pair appears to have its own set of neurons in the brainstem that coordinate the muscle activity and stimulate the next gill pair in the sequence. This system appears to have been maintained from hagfish to teleosts. In tetrapods, on the other hand, various centres in the brainstem coordinate different phases of breathing: expiration, inspiration, and post-inspiration. The location of these centres in the brainstem is similar in amphibians and mammals. The stimulus for regulating ventilatory frequency in water-breathing species is oxygen, whereas for air-breathing species it is blood pH/PCO2—just as in invertebrates.

Gas exchange and its control in non-steady-state systems: the consequences of evolution from water to air breathing in the vertebrates

1988 ◽  
Vol 66 (1) ◽  
pp. 109-123 ◽  
Author(s):  
G. Shelton ◽  
P. C. Croghan
Keyword(s):  
Steady State ◽  
Gas Exchange ◽  
Dynamic Models ◽  
Continuous Process ◽  
Circulatory System ◽  
Lung Ventilation ◽  
Burst Duration ◽  
Air Breathing ◽  
Arterial Blood ◽  
Dissociation Curves

Control of breathing and gas exchange has been extensively investigated in unimodal animals, particularly mammals, in which ventilation is characteristically a regular and continuous process and gas exchange approximates to a steady-state system. Both static and dynamic models have been developed in control-theory analyses. Similar analyses are possible in unimodal fish, though few have been carried out. Control in bimodal animals, such as air-breathing fish and amphibians, is more difficult to understand and model. The evolutionary change from water to air breathing in vertebrates involves not only the adjustment of many control processes but also the development, in the early stages, of non steady states in gas exchangers, blood, and tissues. A simple control-system model, differing from mammalian counterparts in its greater emphasis on storage functions and its intermittently activated controller, is described for two suggested stages in the evolution of air breathing. The first of these stages is air gulping, in which a fixed and rather brief pattern of air breathing is activated by internal signals generated as a result of the inadequacy of the gills to provide sufficient oxygen for tissue metabolism. The second stage is that of burst breathing, in which lung ventilation is both begun and ended by internal signals so that burst duration is variable. The effects of adjusting parameters on variables of evolutionary importance, such as dive duration, burst duration, store renewal, and metabolic rate, can be examined in these two versions of the model. Refinements to incorporate arterial and venous compartments in the circulatory system, the shunting of venous and arterial blood streams in the heart, realistic oxygen dissociation curves, controller inputs from a wider range of sources, and the capacity to respond to some conditions with changes in ventilation rate as well as in burst and dive durations, are being developed. They should make the complex, non-steady-state interactions between gas exchangers, circulating blood, and tissues easier to understand and indicate the likely steps toward the evolution of steady-state systems seen in birds and mammals.

The evolution of water-breathing respiratory faculties in invertebrates

2019 ◽  
pp. 109-112
Author(s):  
Steven F. Perry ◽  
Markus Lambertz ◽  
Anke Schmitz
Keyword(s):  
Circulatory System ◽  
Bilateral Symmetry ◽  
The Body ◽  
Phylogenetic Position ◽  
Control Element ◽  
Term Survival ◽  
Respiratory Proteins ◽  
Evolutionary Story ◽  
Internal Transport

This chapter aims at piecing together the evolution of water breathing in invertebrates. Dedicated respiratory faculties, consisting of an external exchanger, an internal transport system (circulatory system or an equivalent), and some control element are first clearly recognizable among invertebrates in annelids, which excel in the number of different respiratory proteins they display. Molluscs and arthropods use primarily haemocyanin, each group showing evolutionary trends in respiratory proteins that have some bearing on the phylogenetic position. Each major group of molluscs has its own evolutionary story, but in general we see a reduction in the number of gills and often a release from bilateral symmetry. Among arthropods, crustaceans can develop gills on various parts of the legs and the body wall, each group showing a taxon-specific type. Arachnids and hexapods are primarily terrestrial, but several groups have independently and secondarily developed mechanisms for even long-term survival under water.

Control of breathing in invertebrates

2019 ◽  
pp. 100-108
Author(s):  
Steven F. Perry ◽  
Markus Lambertz ◽  
Anke Schmitz
Keyword(s):  
Phylogenetic Group ◽  
Control Of Breathing ◽  
Aquatic Species ◽  
Air Breathing ◽  
Terrestrial Invertebrates ◽  
Internal Ph

Every animal that has a respiratory faculty has some mechanism for regulating its perfusion and ventilation. A prerequisite for such regulation is some way of sensing internal and external levels of respiratory-relevant gases. The regulatory entities can be peripheral, central, or both. This chapter looks at the control of breathing in aquatic and terrestrial invertebrates and concludes that the main signal for aquatic species is oxygen, whereas the internal pH/PCO2 is most important for the control of air breathing, regardless of the phylogenetic group to which the animal may belong.

Iron and chemical control of breathing

Pneumologie ◽  
2010 ◽  
Vol 64 (01) ◽  
Author(s):  
J Antosiewicz ◽  
M Walski ◽  
M Pokorski
Keyword(s):  
Chemical Control ◽  
Control Of Breathing

Control of breathing in patients with brainstem lesions

2007 ◽  
Vol 34 (S 2) ◽  
Author(s):  
ME Schläfke ◽  
C Zumfelde ◽  
B Luka ◽  
T Schäfer ◽  
W Greulich
Keyword(s):  
Control Of Breathing ◽  
Brainstem Lesions

Review on Experimental Study on Effect of Corrosion In Reinforced Concrete Fly-Ash Beam

2020 ◽  
pp. 92-96
Author(s):  
Shubham N. Dadgal ◽  
Shrikant Solanke
Keyword(s):  
Fly Ash ◽  
Bond Strength ◽  
Structural Damage ◽  
Pullout Test ◽  
Partial Replacement ◽  
Structural Members ◽  
Accelerated Corrosion ◽  
Resistivity Method ◽  
Electrical Resistivity Method ◽  
Structural Failures

In modern days for structures in coastal areas it has been observed that the premature structural failures are occurs due to corrosion of the reinforcements of the designed structural member. The corrosion causes the structural damage which in turn leads to reduction in the bearing capacity of the concerned structural members. The aim of this study was to study the effect of partial replacement of fly ash to minimize the corrosion effect. Beams were designed and corroded by using artificial method known accelerated corrosion method. The beams were then tested for flexural and bond strength. Also the weight loss of the reinforced bars was been determined using electrical resistivity method. The fly ash will replace by 10% and 15%.The strength will calculate at varying percentage of corrosion at 10% and 15%. Beams will cast at M25 grade concrete. The flexural strength will test by using UTM and the bond strength will calculate using pullout test.

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