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3ESO Urine formation - Contenido educativo

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Subido el 12 de enero de 2021 por Marta G.

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Hello! Let's continue with the process of excretion. Today we're going to learn 00:00:00
how urine is formed and also other organs involved in the process of excretion. 00:00:07
We start with 2.3 functions of the excretory system. 00:00:23
At this point you should go to the aula virtual and check for a drawing that you have to do 00:00:31
about of a nephron a nephron that in spanish we call it nephrona is a basic unit of the 00:00:36
kidney so each kidney has a lot of these nephrons that compound it and they are going to be 00:00:43
responsible for the formation of urine what is the purpose of them so we had if you check in 00:00:51
your drawing of the anatomy of the urinary system the renal artery artery that is going to take 00:00:58
blood which carries waste it's going to get into the kidney and there is going to to go into 00:01:06
capillaries in the nephrons in the nephrons occurs a process that we have learned now and after this 00:01:14
process the left renal vein is going to get out of the kidney with clean blood so it's in with 00:01:22
the artery the blood that is dirty and gets out with the vein the blood that is clean if you're 00:01:32
taking your drawing you would see that the artery is red and the vein is blue so with that another 00:01:39
remember the differences between arteries and veins and we say that it's not because the artery 00:01:46
is clean and the vein is um is not clean no it's not that we always say that arteries goes from the 00:01:52
heart to the organs and veins go from organs to heart remember that difference 00:01:59
with your beautiful drawing of the nephron all color and beautiful and nice 00:02:11
you're going to follow the explanation okay the stages of urine formation uh it's not that 00:02:18
things get out of the nephron and we form the urine no it's not that the process is more complex 00:02:26
first of all there is a filtration and second step is absorption. Where does filtration 00:02:32
take place? It takes place in the glomerulus. In the glomerulus what happens 00:02:40
is that a lot of substances get out of the blood and gets inside the nephron, inside these tubes 00:02:57
this tube that surrounds the glomerulus. Actually, there are a lot of substances 00:03:04
that get out and they form a liquid which is called primary urine. This 00:03:13
primary urine is a compound of water, is a compound of mineral salts, is a 00:03:21
compound of toxic substances, those substances that we want to get rid of 00:03:33
them and also useful substances. These useful substances could be, for example, 00:03:43
glucose, could be some amino acids that are okay, that we want to keep. So we 00:03:53
need to get from all this primary urine what is good for us and we need to get 00:04:00
them back to the blood circulation. How does it happen? With absorption. So from 00:04:06
this what do we need we need the useful substances we want also mineral salts 00:04:13
and we want water because if we lose too much water we can dehydrate it okay it's 00:04:23
good if we drink too much water to get rid of it so depending on the amount of 00:04:35
water that we have in our body will keep more water inside out or we take more 00:04:40
water out that's why sometimes our urine is very yellowish because it's more 00:04:46
concentrated and sometimes it's more like water depending on the amount of water that you have 00:04:51
drink during the day so useful substance mineral salt and water they are going to be reabsorbed 00:04:56
reabsorbed they are going to be reabsorbed and going back to the blood circulation 00:05:05
and finally we get the urine okay so we take this out and finally the toxic substances the urea 00:05:13
forms the urine and what is the function of the urine you can write it here 00:05:23
underneath okay because I don't have more space here okay we have we have two 00:05:32
main function of the urea urine purifying meaning that we take all these 00:05:41
substances that we don't need out of our body and also regulating as i said we have too much water 00:05:52
inside out we're going to take it out by urine if we have too much imagine that we have eating 00:06:03
food that is very very salty we need to get rid of those salts because if not we have a problem 00:06:09
of salt concentration in the blood so we get rid of it by urine so also regulating is a very 00:06:16
important function of urine not only the kidneys and the urinary system is responsible for the 00:06:23
excretion in the body there are other organs that we already know and also they are involved in this 00:06:33
process 2.4 other organs involved in expression there are three organs that we are going to study 00:06:40
involved in this process of excretion first of all the liver we have already studied the liver we 00:06:54
talk about the liver when we said that the liver neutralize toxins there are a lot of 00:07:00
toxins that come in our body we talk about the preservative that we use in the food 00:07:13
we talk about pesticides and we talk about drugs for example alcohol is one of them if a person 00:07:18
drinks alcohol all the alcohol is going to end up in his or her liver the problem with people 00:07:25
that drink a lot is that the liver cannot get rid of all of it so they can end up in an illness 00:07:34
okay and the liver won't work correctly so it's very important to take care of the liver 00:07:42
so but apart from neutralizing toxics the liver is also responsible for decomposing red blood cells 00:07:48
When we studied the red blood cells or erythrocytes, we said that they were cells without a nucleus. 00:07:55
They have a membrane, they have cytoplasm, but they do not have nucleus. 00:08:17
So they have a short lifetime. They move around our body from about 60 to 80 days. 00:08:20
After that time, they need to be decomposed and that happens in our liver. 00:08:29
they go to the liver and in other organs of our body start forming new red blood cells. 00:08:35
So it's very important that the liver has this function correctly. 00:08:43
Other organs that we have studied already are the lungs. 00:08:48
The lungs reside in the respiratory system and we said that they, 00:08:53
first of all, they take oxygen of course, but we are talking about excretion. 00:08:58
excretion the lungs eliminate carbon dioxide which is not good for our body and the lungs 00:09:02
get ready to eliminate it what about the sweat glands all the sweat glands that we have on our 00:09:15
skin actually when we sweat this sweat is a has the same composition as urine but diluted so sweat 00:09:21
is similar sweat is similar to the urine it has also urea that we have already seen that was one 00:09:35
of the waste products and we eliminate some portion of the urea through our sweat a very 00:09:52
little proportion okay we still need to go to it but sweat glands also has this function 00:09:58
And this is all about the discretion and the different organs involved in this process. 00:10:06
Idioma/s:
en
Autor/es:
Marta García Pérez
Subido por:
Marta G.
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
113
Fecha:
12 de enero de 2021 - 22:09
Visibilidad:
Clave
Centro:
IES FORTUNY
Duración:
10′ 31″
Relación de aspecto:
1.78:1
Resolución:
1920x1080 píxeles
Tamaño:
234.68 MBytes

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