bloque embriología general tema ovulación, fecundación implantación introducción en la pubertad comienzan los ciclos menstruales de la mujer. esto ciclos. fecundación desarrollo fetal gametogénesis es el proceso por el cual las es proporcionar un medio nutritivo para la nidación y el mantenimiento del huevo. tema embriología humana. fecundación. implantación. organogénesis. La masa celular externa forma el trofoblasto (placenta) Blastocisto: Embrión de .
|Published (Last):||21 January 2007|
|PDF File Size:||8.83 Mb|
|ePub File Size:||10.38 Mb|
|Price:||Free* [*Free Regsitration Required]|
Moreover, many of our life actions are related to the reproductive process, such as finding the person we want to have children with, living with this person, taking care of children, etc.
There are two different types of chromosomes that determine the sex of the individual, first one are called sex chromosomeswhich are the X chromosome and the Y chromosome, and the placwntacion 44 chromosomes are called non-sex chromosomes that are common equaly for women and men. If inside the cells are nidacuon X chromosomes the individual is female and if there is an X and an Y the individual is a man. The chromosome is a DNA molecule coiled up around itself and a gene is a DNA segment that contains information about given characteristics of the organism.
Activity in English is under construction. In a doubt is always better to abstain or use a condom. In human, somatic cells have 46 chromosomes and gametes have 23 chromosomes.
It can distinguish three phases: We all should know how sex cells are formed and the process of the fertilization, pregnancy and childbirth. The placenta is formed from the capillaries of the embryo and of the endometrium. There are two types of meiosis: The first structure that is formed is a solid cell mass morula moves down through the fallopian tube. This, containing 23 chromosomes, joins the ovum nucleus, which also contain 23 chromosomes and a cell is formed with a core containing 46 chromosomes, called the zygotewhich is the first cell of the new individual.
The period from the moment of fertilization until the birth is called the pregnancy. In the reproduction it is clear that men and women are not equal, but complementary. It is the process of the expulsion of the fetus. After nine weeks, the embryo has a length of 3 to 4 cm, weighs about 2 to 4g, has almost all organs and a human form, so it is called a fetus.
This process is accompanied by a loss of blood and discomfort that may be serious, it lasts 3 to 5 days and repeats every days, for this it is called the menstrual cycle. During this phase, uterine contractions start they occur every 30 minutes at the beggining and at the end – every 3 minutes.
Standards of prevention of sexually transmitted diseases. During this phase, the contractions occur every 2 minutes and are more intense, causing the exit of the child after half an placentacionn.
If it does not find any egg it dies after about 3 or 4 days. The egg is released about two weeks after the beggining of the menstruation and lives around 24 hours, during which it can be fertilized.
FECUNDACION Y NIDACION by dayana garrido on Prezi
The ovulation happens when the concentration of the LH in the blood reaches its maximum superiority over the fecundaciln of the FSH. This phase lasts around 8 hours.
Interestingly we invest a lot of energy to give rise to cells that are nor for our use but to generate other individuals, they are called the sexual or reproductive cells.
These three diseases, which are or may be mortal, have increased significantly in the recent years becouse of the overconfidence.
During fcundacion phase, about 20 minutes after birth, the contractions restart and the placenta is ejectedwhich was previously detached, it is a process that is accompanied with small bleeding.
If it find the egg, the spermatozoa surround it but only one gets through the membrane and enters the nucleus. Animation on pregnancy and the childbirth Spanish activity. Well, it all is expained in this chapter. Multiple Choice Test Spanish activity. The detachment of the endometrium is called a menstruation or a period.
In the following drawing the gametogenesis in the rat is showed.
It is implanted on the uterine’s mucous membrane nesting. In the spermatogenesis each stem cell originates 4 spermatozoa, while in oogenesis the stem cell originates only one egg, in each division one of the two daughter cells is degraded.
Gestación de los animales
Then read the text on fertilization, embryonic development and the childbirth and perform the second Multiple Choice Test, the second Relate Pictures with Names and the Crossword. In humans the process is a bit more complicated, since the sperm is not fecjndacion to an egg but to an oocyte of the second type.
A mass with a hollow interior blastula is formed from it. The sperm is injected into the vagina and goes up to the uterus and then to the fallopian tubes. This organ allows providing oxygen O2 and nutrients from the maternal blood to the embryo and transfer carbon nidacoin CO2 and excretory products mainly urea produced by the embryo to maternal blood.
This happens about six days after fertilization. Then placenntacion zygote begins to multiply embryonic development and gives rise to the embryo. There are many changes taking place in women’s body, both physical and chemical hormonesand psychological.
As a result, when two different types of sex cells unite in order to form the first somatic cell of the new being, the number of chromosomes suitable for those cells is recuperated.
Otherwise the children would have twice as many chromosomes as their parents. Then the child is put upside down and given a pat on the back to empty the water from the lungs and begin to breath first cryand the the umbilical cord is cut and tied. In conclusion, the woman is the main character of this story. In case of women, the reproduction involves greater physical and mental effort than it happens for men, since it involves having a period every month for most of theirs life, pregnancy, childbirth and breastfeeding.
The pass from somatic cells to sex cells is called meiosis and consists of two successive cell divisions.