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3ESO Gametogenesis - Contenido educativo

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Subido el 24 de abril de 2021 por Marta G.

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did you know that it takes for the spermatozoa from 62 to 75 days to be formed 00:00:00
or that in each ejaculation man can release for nearly 250 million of spermatozoa and how much 00:00:10
does the spermatozoa take to get to the oven depends on the quality of the spermatozoa 00:00:22
but from 30 minutes until two days. We are going to learn more about the formation of 00:00:30
spermatozoa and the female menstrual cycle. Let's go today with point number five, 00:00:39
status of reproduction. We have learned about the male reproductive system, we have 00:00:56
learn about the female reproductive system, we now need to take them into action for the function 00:01:04
that they need to do and follow the next steps. First of all, gametogenesis. This step is the 00:01:11
formation of gametes. If you remember from last video, gametes were sex cells, ovum and spermatozoa. 00:01:19
Then the ovum and spermatozoon need to get together by the process of fertilization. 00:01:29
When they join, they form the new embryo which is going to be placed inside his or her mother, 00:01:36
which is called gestation, and finally get out of the mother by the process of birth. 00:01:44
We are going to learn about all these stages. 00:01:50
First of all, let's start with the formation of those gametes by the process of gametogenesis 5.1. 00:01:53
We start with the male reproductive system formation of sperm cells. 00:02:00
If you remember, we say that these sperm cells are formed inside the gonads and these gonads in the male are the testicles. 00:02:05
The inner structure of this testicle are these seminiferous tubes in which these cells are formed. 00:02:14
However, these seminiferous tubules, they need some input that says that they need to start producing spermatozoa. 00:02:22
How do they do it? By testosterone. 00:02:31
Testosterone is a hormone which is going to tell to the seminiferous tubule that they need to get started. 00:02:33
If you remember, we say that spermatia was the point in which the boy changes into adulthood 00:02:40
because it has the first ejaculation. 00:02:51
So, we are in the seminiferous tubules and the testosterone comes. 00:02:54
The cells which are in the seminiferous tubules start with the multiplication. 00:02:58
These cells are called spermatogonium, in plural will be spermatogonia. 00:03:03
Spermatogonium divides. 00:03:09
Each cells of this spermatogonium are going to grow 00:03:11
and they are going to change into a different shade, 00:03:15
different organelles inside, so they change into another type of cells, what we call spermatocytes. 00:03:19
In the maturation process, the spermatocyte is going to divide, but it's not a normal cell 00:03:27
division. It's another type of cell division, which is called meiosis. Through this meiosis, 00:03:33
these spermatocytes are going to change into spermatids. Till now, our cells, the spermatogonium, 00:03:39
spermatozoa and spermatids they have the typical round shape that most of the cells have however 00:03:47
in step number four differentiation these spermatids are going to change and are going 00:03:54
to have the typical shape of the spermatozoa with the head with the neck and with the tape that you 00:03:59
should have drawn in your notebook already and now to illustrate all this process you have a very 00:04:07
beautiful drawing in the aula result which you need to reply in your notebook so start tracing 00:04:14
make it beautiful underneath all this information about the female reproductive system and the ova 00:04:22
if you remember we say that all the ova were formed when the girl was in her mother's womb 00:04:30
so think about any girl of the class okay any of you girls have your ova since you were a fetus 00:04:37
inside your mother's womb which is quite amazing so but it's a long long time ago so we are not 00:04:45
going to focus on that of that we're going to focus on what is happening now the ovarian and 00:04:51
menstrual cycle they both are 28 days long however they imply different places of the female 00:04:59
reproductive system the ovarian cycle relates with the changes that happens in the ovary during those 00:05:10
28 days and the menstrual cycle implies the changes to the lining the interior lining of the uterus 00:05:15
the endometrium and how it is prepared in case there is a gestation or in case it is released 00:05:22
in case there is not now you have another beautiful drawing in the elevator with a 00:05:29
lot of information that you need to copy so i want you to have that drawing ready for next 00:05:35
day when we come to class because it's a drawing that is a bit a little bit complicated to 00:05:42
understand, so I would prefer to explain it in class with you in front, so you can ask questions, 00:05:48
but it's very important that you make that drawing today. And that's all for today, see you next day! 00:05:54
Idioma/s:
en
Autor/es:
Marta García Pérez
Subido por:
Marta G.
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
106
Fecha:
24 de abril de 2021 - 12:26
Visibilidad:
Clave
Centro:
IES FORTUNY
Duración:
06′ 17″
Relación de aspecto:
1.78:1
Resolución:
1920x1080 píxeles
Tamaño:
372.05 MBytes

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