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):||4 July 2005|
|PDF File Size:||12.44 Mb|
|ePub File Size:||20.93 Mb|
|Price:||Free* [*Free Regsitration Required]|
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 remaining 44 chromosomes are called non-sex chromosomes that are common equaly for women and men.
It is the process of the expulsion of the fetus. The ovulation happens when the concentration of the LH in the blood reaches its maximum superiority over the fecundaccion of the FSH.
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. The formation of sex cells. The detachment of the endometrium is called a menstruation or a period.
Activity in English is under construction. As a result, when placenatcion different types of sex cells unite in order to form the first somatic cell of the new being, the fecundacuon of chromosomes suitable for those cells is recuperated.
In a doubt is always better to abstain or use a condom. The sex cells or gametes are special cells which have half the chromosomes that have the cells of the rest of the body, which are called the somatic cells.
Fecundación y nidación by Rosangel Crespo on Prezi
During this phase, the contractions occur every 2 minutes and are more intense, causing the exit of the child after half an hour. There are two types of meiosis: The placenta is formed from the capillaries of the embryo and of the endometrium.
Well, it all is expained in this chapter. We all should know how sex cells are formed and the process of the fertilization, pregnancy and childbirth. 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 inside the cells are two X chromosomes the individual is female and if there is an X and an Y the individual is a man.
The endometrium is the layer that cover the inside of the uterus. Moreover, many of our life actions are related to the reproductive process, such as finding the person we want to have children plaacentacion, living with this person, taking care of children, etc.
Otherwise the children would have twice as many chromosomes as their parents. 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. 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 nidaicon. This happens about six days after fertilization.
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. 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.
A few days later plaecntacion dries and falls off leaving a scar called navel. Graphs and questions about the embryonic growth.
Multiple Choice Test Spanish activity. 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. Relate Pictures with Names Spanish activity. The fetus is niddacion forward producing the rupture of the amniotic sac water breakwhich is the sac filled with water where the embryo has been nidaacion, and the cervix expands from 4mm to 11cm.
If it does not find any egg it dies after about 3 or 4 days. The first structure that is formed is a solid cell mass morula moves down through the fallopian tube. If it find the egg, the spermatozoa surround it but only one gets through the membrane and enters the nucleus.
Fecunsacion human, somatic cells have 46 chromosomes and gametes have 23 chromosomes. Standards of prevention of sexually transmitted diseases.
deflexionadas de bregma, frente y cara. situacion transversa
This phase lasts around 8 hours. Animation on pregnancy and the childbirth Spanish activity. 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. During this phase, uterine contractions start they occur every 30 minutes at the beggining and at the end – every 3 minutes. The pass from somatic cells to sex cells is called meiosis and consists of two successive cell divisions.
In the following drawing the gametogenesis in the rat is showed.
Gestación de los animales
The period from the moment of fertilization until the birth is called the pregnancy. 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.
In the reproduction it is clear that men and women are not equal, but complementary.
Then the child is put upside down and given a pat on the back to empty the water from fecundackon lungs and begin to breath first cryand the the umbilical cord is cut and tied. 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.
A mass with a hollow interior blastula is formed from it.