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An unbridgeable gap exists between the simple urinary system used in invertebrates and the far more complex kidney system used in all vertebrates.
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[__ Science __ ] Evolution of the Vertebrate Kidney Baffles Evolutionists
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Barbarian
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- Jun 5, 2003
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Well, let's take a look at that assumption...
The evolution of the kidney is one of the most exciting topics in evolutionary biology and several fields of science. This is because the kidney offers clear evidence of the effect of evolutionary pressures on the development of organs and the ability of scientists to study the development of human metanephroi.
Kidneys are seen in all vertebrates, and just like the ones found in human beings, they are also made up of nephrons. But the thing is that there are differences in the structure and function of the several vertebrate kidneys that allow for adaptation to the environment that the animals are found.
The excretory system is responsible for regulating the chemicals found in the body by sorting the removal of metabolic wastes and seeing to the retention of the correct amounts of water, nutrients, and salts. The invertebrates’ excretory system is also categorized based on the differences in their morphology-based, and this is done in three kinds.
The evolution of the kidneys in vertebrates becomes an interesting tale when seen from the external osmotic environment in which the different classes have had their evolutionary trends. Marine, freshwater, and terrestrial habitats have several issues regarding the maintenance of internal water balance alongside nitrogenous wastes’ excretion. Hence, there are several variations in the evolution of the kidney and these are correlated with the factors of the environment.
A study of kidney’s evolution in vertebrates shows how the mesonephric, pronephric, and metanephric kidneys are representations of the success in evolution trends alongside correlation done with factors of the environment. Differences in the morphology of the vertebrate kidney from aquatic creatures to man are mainly changes in the number, structure, modification, and placement of the renal tubules.
When it comes to embryological origins, the kidney, as seen in all vertebrates, originates from what is known as the intermediate mesoderm. This layer is the one that will later form the kidney, and this is why it is called the nephrogenic mesoderm. The kidney itself overall has two elements, and these are the kidney tubules and the kidney duct.
The kidneys’ tubules are called nephrons and are referred to as the evolutionary modifications seen in the nephridia and are known as the functional units of the kidneys.
The development of the kidney is described as being complicated, and this is based on the premise that two or even three different kinds of kidneys are based on the species formed in spatial and temporal sequence. The largest, most anterior, and first part when it comes to development is the pronephric kidney. Then there is the second kidney in the formation sequence and it is known as the mesonephric kidney. In reptiles, mammals, and birds, a third kidney is known as the metanephric kidney and develops to the posterior of the mesonephros.
Even though the mesonephros is fundamentally an embryonic kidney seen in amniotes, it works for a limited time after birth, as seen in reptiles, marsupials, and monotremes. In the meantime, there is a new kidney utilized by amniotes utilized for life, and that is the metanephros. Once the metanephros takes over a kidney’s works, there is involution in the mesonephros and what is left after birth are just the remnants.
nykdaily.com
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Pediatr Nephrol 2011 Sep;26(9):1559-65.
Hox genes and kidney development
The evolution of the kidney is one of the most exciting topics in evolutionary biology and several fields of science. This is because the kidney offers clear evidence of the effect of evolutionary pressures on the development of organs and the ability of scientists to study the development of human metanephroi.
Kidneys are seen in all vertebrates, and just like the ones found in human beings, they are also made up of nephrons. But the thing is that there are differences in the structure and function of the several vertebrate kidneys that allow for adaptation to the environment that the animals are found.
The excretory system is responsible for regulating the chemicals found in the body by sorting the removal of metabolic wastes and seeing to the retention of the correct amounts of water, nutrients, and salts. The invertebrates’ excretory system is also categorized based on the differences in their morphology-based, and this is done in three kinds.
The evolution of the kidneys in vertebrates becomes an interesting tale when seen from the external osmotic environment in which the different classes have had their evolutionary trends. Marine, freshwater, and terrestrial habitats have several issues regarding the maintenance of internal water balance alongside nitrogenous wastes’ excretion. Hence, there are several variations in the evolution of the kidney and these are correlated with the factors of the environment.
A study of kidney’s evolution in vertebrates shows how the mesonephric, pronephric, and metanephric kidneys are representations of the success in evolution trends alongside correlation done with factors of the environment. Differences in the morphology of the vertebrate kidney from aquatic creatures to man are mainly changes in the number, structure, modification, and placement of the renal tubules.
When it comes to embryological origins, the kidney, as seen in all vertebrates, originates from what is known as the intermediate mesoderm. This layer is the one that will later form the kidney, and this is why it is called the nephrogenic mesoderm. The kidney itself overall has two elements, and these are the kidney tubules and the kidney duct.
The kidneys’ tubules are called nephrons and are referred to as the evolutionary modifications seen in the nephridia and are known as the functional units of the kidneys.
The development of the kidney is described as being complicated, and this is based on the premise that two or even three different kinds of kidneys are based on the species formed in spatial and temporal sequence. The largest, most anterior, and first part when it comes to development is the pronephric kidney. Then there is the second kidney in the formation sequence and it is known as the mesonephric kidney. In reptiles, mammals, and birds, a third kidney is known as the metanephric kidney and develops to the posterior of the mesonephros.
Even though the mesonephros is fundamentally an embryonic kidney seen in amniotes, it works for a limited time after birth, as seen in reptiles, marsupials, and monotremes. In the meantime, there is a new kidney utilized by amniotes utilized for life, and that is the metanephros. Once the metanephros takes over a kidney’s works, there is involution in the mesonephros and what is left after birth are just the remnants.
Evolution of the Kidney - NYK Daily
The evolution of the kidney is one of the most exciting topics in evolutionary biology and several fields of science. This is because the kidney offers
nykdaily.com
There's more...
Pediatr Nephrol 2011 Sep;26(9):1559-65.
Hox genes and kidney development
Abstract
The adult mammalian kidney is generated by the differentiation and integration of several distinct cell types, including the nephrogenic mesenchyme, ureteric epithelium, stromal and endothelial cells. How and where these cell types are generated and what signals lead to their differentiation and integration into a functional organ system is a main focus of current studies. Herein, we review the formation of distinct cell types within the adult mammalian kidney; what is understood regarding their origin and the signaling pathways that lead to their formation and integration; morphogenetic changes the metanephric kidney undergoes during development; and what is known regarding the role of Hox genes in these processes.
Truthfrees
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- May 24, 2017
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thanks
Barbarian
Member
- Jun 5, 2003
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Figure 1.
Lineage relationships within the developing mammalian metanephros. The metanephros arises from the intermediate mesoderm, which gives rise to the nephric duct and the metanephric mesenchyme. The former gives rise to the cells of the collecting duct system, whereas the latter gives rise both to the epithelial components of the nephrons (excluding collecting duct) as well as stromal and vascular elements. Key marker genes for compartments are indicated in gray ovals.
To creationists, these common pathways in the development of kidneys in mammals are a baffling puzzle. But they are completely understandable in light of evolution.