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 .

Author: Goltisida Negor
Country: Uruguay
Language: English (Spanish)
Genre: Music
Published (Last): 12 April 2013
Pages: 57
PDF File Size: 18.19 Mb
ePub File Size: 20.87 Mb
ISBN: 527-1-89498-305-2
Downloads: 21268
Price: Free* [*Free Regsitration Required]
Uploader: Kebar

deflexionadas de bregma, frente y cara. situacion transversa

The detachment of the endometrium is called a menstruation or a period. If it find the egg, the spermatozoa surround it but only one gets through the membrane and enters the nucleus. Graphs and questions about the embryonic growth.

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. The endometrium is the layer that cover the inside of the uterus. The period from the moment of fertilization until the birth is called the pregnancy.

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. In the following drawing the gametogenesis in the rat is showed. In a doubt is always better to abstain or use a condom. Multiple Choice Test Spanish activity. In feucndacion the process is a bit more complicated, since the sperm is not attached to an egg but to an oocyte of the second type.

During this phase, the contractions occur every 2 minutes and are more intense, causing the exit of the child after half an hour. Read the explanations on the formation of gametes and the menstrual cycle and perform the first Multiple Choice Test and the first Relate Pictures with Names.

In the reproduction it is clear that men and women are not equal, but complementary. The formation of sex cells. 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.


Relate Pictures with Names Placentcaion activity. The placenta is formed from the capillaries of fecundacin embryo and of the endometrium. The first structure that is formed is a solid cell mass morula moves down through the fallopian tube.

This phase lasts around 8 hours. During this phase, uterine contractions start they occur every 30 minutes at the beggining and at the end – every 3 minutes. This happens about six frcundacion after fertilization.

FECUNDACION Y NIDACION by dayana garrido on Prezi

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. There are many changes taking place in women’s body, both physical and chemical hormonesand psychological. Activity in English is under construction.

The fetus is urged forward producing the rupture of the amniotic sac water breakwhich is the sac filled with water where the embryo has been living, and the cervix expands from 4mm to 11cm.

We all should know how sex cells are formed and the process of the fertilization, pregnancy and childbirth. During this 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. Otherwise the children would have twice as many chromosomes as their parents.

In case of women, the reproduction involves fecunfacion physical and mental effort than it happens for men, since it involves having a period ppacentacion month for most of theirs life, pregnancy, childbirth and breastfeeding. Then the zygote begins to multiply embryonic development and gives rise to the embryo.

In human, somatic cells have 46 chromosomes and gametes have 23 chromosomes. 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.

If it does not find any egg it dies after about 3 or 4 days. In conclusion, the woman is the main character placenatcion this story. Well, it all is expained in this chapter. The pass from somatic cells to sex cells is called meiosis and consists of two successive cell divisions.


Animation on pregnancy and the childbirth Spanish activity. A few days later it dries and falls off leaving a scar called navel. The sperm is injected into the vagina and goes up to the uterus and then to the fallopian tubes.

The ovulation happens when the concentration of the LH in the blood reaches its maximum superiority over fecumdacion concentration of the FSH. It should be remembered that the basic rule of prevention is to never have sex without a condom with a person we do not have full confidence if they are currently having or have just had sex with an other person. The egg is released about two weeks after the beggining of the menstruation and lives around 24 hours, during which it can be fertilized.

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. This organ allows providing oxygen O2 and nutrients from the maternal blood to the embryo and transfer carbon dioxide CO2 and excretory products mainly urea produced by the embryo to maternal blood.

It is the process of the expulsion of the fetus. It is implanted on the uterine’s mucous membrane nesting. The chromosome is a DNA molecule coiled up around itself and a gene is a DNA segment that contains fecundaciin about given characteristics of the fecundafion. Standards of prevention of sexually transmitted diseases. It usually endures about nine months. There are two types of meiosis:

Author: admin