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 .

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The ovulation happens when the concentration of the LH in the blood reaches its maximum superiority over the 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 endometrium is the layer that cover the inside of the uterus.

If inside the cells are two X chromosomes the individual is female and if there is an X and an Placentackon the individual is a man. Graphs and questions about the embryonic growth. If it find the egg, the spermatozoa surround it but only one gets through the membrane and enters the nucleus.

In the following drawing the gametogenesis in the rat is showed. It can distinguish three phases: In conclusion, the woman is the main character of this story. 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. It usually endures about nine months. Then the zygote begins to multiply embryonic development and gives rise to the embryo.

Multiple Choice Test Spanish activity. 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. This phase lasts around 8 hours.

There are two different types of chromosomes that determine the sex of the individual, first one are called sex chromosomeswhich are the X chromosome fecundacoon the Y chromosome, and the remaining 44 chromosomes are called non-sex chromosomes that are common equaly for women and men.

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. In the reproduction it is clear that men and women poacentacion not equal, but complementary.


This happens about six days after fertilization.

FECUNDACION Y NIDACION by dayana garrido on Prezi

The nidqcion of the endometrium is called a menstruation or a period. A few days later it dries and falls off leaving a scar called navel. 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.

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. The first structure that is formed is a solid cell mass morula moves down through the fallopian tube. There are two types of meiosis: In humans the process is a bit more complicated, since the sperm is not attached to an egg but to an oocyte of the second type.

Moreover, many of our life actions are related to the reproductive process, fecunfacion as finding the person we want to have children with, living with this person, taking care of children, etc. These three diseases, which are or may be mortal, have increased significantly in the recent years becouse of the overconfidence. A mass with a hollow interior blastula is formed from it.

The egg is released about two weeks after the beggining of the menstruation and lives around 24 hours, during which it can be fertilized. The fetus is urged forward producing the rupture of the amniotic sac water breaknisacion is the sac filled with water where the embryo has been living, and the cervix expands from 4mm to 11cm.

It is the process of the expulsion of the fetus.

Gestación de los animales

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. 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. Well, it all is expained in this chapter. 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.

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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.

deflexionadas de bregma, frente y cara. situacion transversa

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. The formation of sex cells. Animation on pregnancy and the childbirth Spanish activity. Standards of prevention of sexually transmitted diseases. In a doubt is always better to abstain or use a condom.

The placenta is formed from the capillaries of the embryo and of the endometrium. 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. In human, somatic cells have 46 chromosomes and gametes have 23 chromosomes. The pass from somatic cells to sex cells is called meiosis and consists of two successive cell divisions.

If it does not find any egg it dies after about 3 or 4 days. It is implanted on the uterine’s mucous membrane nesting. During this phase, uterine contractions start they occur every 30 minutes at the beggining and at the end – every 3 minutes.

The sperm is injected into the vagina and goes up to the uterus and then to the fallopian tubes. 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. There are many changes taking place in women’s body, both physical and chemical hormonesand psychological. 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.