The germinal stage involves several different processes that change an egg and sperm first into a zygote, and then into an embryo. The processes include fertilization, cleavage, blastulation, and implantation.
What stage is the germinal stage?
The germinal stage of development is the first and shortest of the stages of the human lifespan. It lasts roughly eight to nine days, beginning with fertilization and ending with implantation in the endometrium of the uterus, after which the developing organism is called an embryo.
What is the germinal period quizlet?
germinal period. The period of prenatal development that takes place in the first two weeks after conception. It includes the creation of the zygote, continued cell division, and the attachment of the zygote to the uterine wall.
How long after conception is implantation?
Implantation takes place anywhere between 6 and 12 days after you ovulate. It most commonly occurs 8 to 9 days after conception. So the exact date of implantation can depend on when you ovulated, and whether conception occurred early or late in the ovulation window.
When do the germinal and embryonic periods occur quizlet?
A) The germinal and embryonic periods occur during the first trimester, and the fetal period begins during the first trimester.
What is the zygotic stage?
zygote, fertilized egg cell that results from the union of a female gamete (egg, or ovum) with a male gamete (sperm). In the embryonic development of humans and other animals, the zygote stage is brief and is followed by cleavage, when the single cell becomes subdivided into smaller cells.
What are the signs of successful implantation?
Signs Your Embryo Transfer May Have Been Successful
Spotting.Cramping.Sore breasts.Tiredness.Nausea.Bloating.Discharge.Increased urination.
How do I know if it’s implantation bleeding or my period?
Implantation bleeding is more likely to be a pinky-brown color. Menstrual bleeding, on the other hand, may start off light pink or brown, but it soon changes into crimson red. Strength of flow. Implantation bleeding is usually super-light spotting.
What are the symptoms of 4 days pregnancy?
Can I have pregnancy symptoms at 4 DPO?
Cramps. The earlier days of pregnancy may include abdominal cramping. Spotting. This may be implantation bleeding and typically happens around 6 to 12 days after the egg gets fertilized. Nausea. Tender breasts.
Which activities take place during the germinal period of prenatal development quizlet?
What happens during the germinal period of development? The protective structures of the fetus start to form and provide nourishment from the mother, and the zygote turns into an embryo. You just studied 25 terms!
Which of these prescription drugs are most likely to function as teratogens?
Drugs that are capable of acting as teratogens include:
ACE (angiotensin converting enzyme) inhibitors such as: Acne medication isotretinoin (Accutane, Retin-A).Alcohol ingested chronically or in binges.Androgens (male hormones).Antibiotics tetracycline (Achromycin), and doxycycline (Vibramycin), and streptomycin.
When do teratogens have the greatest effects quizlet?
Why does the timing of teratogenic exposure matter? – The effects of a teratogenic agent are worst during the critical period when an organ system grows most rapidly. – Organogenesis takes place during the embryonic period (weeks 3-8 of prenatal development).
