CORPUL TAU: FERTILIZATION
Fertilization occurs when the head of a sperm penetrates a mature ovum. După penetrare, nucleelor (care conțin materialul genetic) a siguranței spermei și a ovulului, iar corpul si coada meniurile spermei off. The newly fertilized ovum cal
led a zygote then forms an outer layer that is impenetrable to other sperm. Zigotul repetate suferă o diviziunile celulare pe măsură ce trece prin trompe. Până în momentul în care ajunge la uter, it has grown into a solid ball of cells called a morula. It then develops an inner cavity with a small cluster of cells to one side, this is called a blastocyst. The blastocyst implants in the wall of the uterus, at this point it is known as an embryo.
Ovulation occurs halfway through the menstrual cycle (13-16) before the start of a period, after which the released ovum is available for fertilization for about two days. Sperm can also live for about two days, so the peak fertile period is about four days (two per and two post-ovulation).
Blood circulation in the fetus is different from the normal circulation after birth. The fetus neither breathes nor eats, so oxygen and nutrients are obtained, via the placenta and umbilical cord, from the mother’s blood. The other fundamental difference in circulation is that blood bypasses the lungs in the fetus.
Fetal distress sometimes occurs as a temporary episode, dar, if acidosis is severe, the distressed fetus.
FETAL HEART CIRCULATION
In the fetus, blood passes directly from the right atrium of the heart to the left atrium through the foramen ovale. Another channel, the ductus arteriosus, allow blood to pass from the pulmonary artery to the aorta. After both channel close, redirecting blood through the lungs.
Sper ca iti place acest articol, dacă ai făcut asigurați-vă că da o degetele în sus și un comentariu bun de mai jos în jos.