People grow out 2 kidneys, is forced to
The kidneys are differentiated from the mesoderm, and the organs that are differentiated from the mesoderm are symmetrical, both sides.
What is the midgut?
We are still in the mother's stomach, long this:
Look at the marked "little" person, the middle layer, is the mesoderm;
The inner layer, we call it called endoderm;
"So, outside the layer of le?"
nonsense! Of course called ectoderm.
1. Endoderm: from mouth to asshole
Endoderm differentiation into our body the most inside the structure, and the kidney is not the same, not symmetrical, but a single. Mainly digestive tract, digestive gland, trachea, lung, thyroid, parathyroid, thymus, bladder and so on.
The mouth, and the anus, string a string, string a bend "tube", string a string of visceral circle ... ... the tube and the tube above the main things are developed, is the asymmetric organ.
Doctor you deceive! The lungs are symmetrical, one side!
you sure? On the surface of the lung is divided into two left and right, looks like axis symmetry, but it is not.
We have two lung lobes left lung, right lung has three lobes, between the lungs is not linked. Which is why a lot of pneumonia is confined to the cause of a lobe. So it looks like a lung symmetrical organ, but the actual is not.
2. Ectoderm; exposed shells
The germ layer, the main development of our most out of the organization, including the skin, hair, etc., these organizations in addition to the brain and the spinal cord, the other is basically a "skin", wrapped in our body on the outside. More specifically, the brain, the spinal cord is also its development.
what? Do you say that the brain is also a skinny?
Yes. Long ago, about a few hundred years ago, we are still unknown insects when it is not long brain. Later, the front of the skin first contact with the external environment, the need to perceive changes in the surrounding environment, so the nerve more and more rich, gradually evolved into the brain.
Although the brain is the control center of our body, but the body of the brain, in fact, the outer skin.
3. Mesenchymal layer: and the embryo that flirtatious bitch is not the same
This layer is very important, our kidneys are in this layer. If there is no such layer, we and the coral nothing difference. This layer is mainly responsible for the generation of bones, muscles, blood vessels, and urinary, reproductive system. Think carefully that you can find that these organizations are axisymmetric.
skeleton:
Is it symmetrical?
muscle:
Or is it symmetrical?
Reproductive organs:
Is it symmetrical?
So we can conclude that the kidney is forced to be two long due to the characteristics of mesodermal development.
A kidney not work?
Line is OK, but this will be more fragile.
Kidney is a factory, each kidney has 100 lines of staff, so that there are a total of 200 employees.
The usual workload of 100 people will be able to fully cope, so there are some people in the rest, some people at work, this can still take off.
Occasionally, when the workload is too large, 150 people can cope, some staff too tired to jump, but it is more than enough.
Originally life is so beautiful, but ...
If there is only one kidney, when employees jumped, other employees have to increase the workload, so tired get on the ground. Slowly le, fewer employees, the workload is large, jumping more and more. The vast majority of employees are jumping to the time, to the uremia.
A kidney can also be, the premise is that you have to ensure a healthy diet, regular living, calm, do not let the boss of the boss jumped, a jump we all follow the jump.
The kidneys are differentiated from the mesoderm, and the organs that are differentiated from the mesoderm are symmetrical, both sides.
What is the midgut?
We are still in the mother's stomach, long this:
Look at the marked "little" person, the middle layer, is the mesoderm;
The inner layer, we call it called endoderm;
"So, outside the layer of le?"
nonsense! Of course called ectoderm.
1. Endoderm: from mouth to asshole
Endoderm differentiation into our body the most inside the structure, and the kidney is not the same, not symmetrical, but a single. Mainly digestive tract, digestive gland, trachea, lung, thyroid, parathyroid, thymus, bladder and so on.
The mouth, and the anus, string a string, string a bend "tube", string a string of visceral circle ... ... the tube and the tube above the main things are developed, is the asymmetric organ.
Doctor you deceive! The lungs are symmetrical, one side!
you sure? On the surface of the lung is divided into two left and right, looks like axis symmetry, but it is not.
We have two lung lobes left lung, right lung has three lobes, between the lungs is not linked. Which is why a lot of pneumonia is confined to the cause of a lobe. So it looks like a lung symmetrical organ, but the actual is not.
2. Ectoderm; exposed shells
The germ layer, the main development of our most out of the organization, including the skin, hair, etc., these organizations in addition to the brain and the spinal cord, the other is basically a "skin", wrapped in our body on the outside. More specifically, the brain, the spinal cord is also its development.
what? Do you say that the brain is also a skinny?
Yes. Long ago, about a few hundred years ago, we are still unknown insects when it is not long brain. Later, the front of the skin first contact with the external environment, the need to perceive changes in the surrounding environment, so the nerve more and more rich, gradually evolved into the brain.
Although the brain is the control center of our body, but the body of the brain, in fact, the outer skin.
3. Mesenchymal layer: and the embryo that flirtatious bitch is not the same
This layer is very important, our kidneys are in this layer. If there is no such layer, we and the coral nothing difference. This layer is mainly responsible for the generation of bones, muscles, blood vessels, and urinary, reproductive system. Think carefully that you can find that these organizations are axisymmetric.
skeleton:
Is it symmetrical?
muscle:
Or is it symmetrical?
Reproductive organs:
So we can conclude that the kidney is forced to be two long due to the characteristics of mesodermal development.
A kidney not work?
Line is OK, but this will be more fragile.
Kidney is a factory, each kidney has 100 lines of staff, so that there are a total of 200 employees.
The usual workload of 100 people will be able to fully cope, so there are some people in the rest, some people at work, this can still take off.
Occasionally, when the workload is too large, 150 people can cope, some staff too tired to jump, but it is more than enough.
Originally life is so beautiful, but ...
If there is only one kidney, when employees jumped, other employees have to increase the workload, so tired get on the ground. Slowly le, fewer employees, the workload is large, jumping more and more. The vast majority of employees are jumping to the time, to the uremia.
A kidney can also be, the premise is that you have to ensure a healthy diet, regular living, calm, do not let the boss of the boss jumped, a jump we all follow the jump.
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